watch The Big Bang Theory free online

194 Available, 196 Aired
Last Aired S10E10 on Dec 01, 2016
194 episodes available of 196 aired
6.9 (790 Ratings)
22 Min

The Big Bang Theory is centered on five characters living in Pasadena, California: roommates Leonard Hofstadter and Sheldon Cooper; Penny, a waitress and aspiring actress who lives across the hall; and Leonard and Sheldon's equally geeky and socially awkward friends and co-workers, mechanical engineer Howard Wolowitz and astrophysicist Raj Koothrappali. The geekiness and intellect of the four guys is contrasted for comic effect with Penny's social skills and common sense.

Show Keywords: geek, nerd, comic, friends, scientist
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All The Big Bang Theory (2007) Episodes

The Big Bang Theory Seasons

  1. Watch The Big Bang Theory Season 10 S10
    10 of 10 Ep. Available 2016
  2. 19 of 21 Ep. Available 2015
  3. 22 of 22 Ep. Available 2015
  4. 23 of 23 Ep. Available 2013
  5. 19 of 19 Ep. Available 2012
  6. 20 of 20 Ep. Available 2011
  7. 22 of 22 Ep. Available 2010
  8. 22 of 22 Ep. Available 2009
  9. 21 of 21 Ep. Available 2008
  10. 16 of 16 Ep. Available 2007

The Big Bang Theory Episodes

  1. 24
    Available Aired on May 12, 2016
  2. 23
    Available Aired on May 05, 2016
  3. 22
    Available Aired on Apr 28, 2016
  4. 20
    Available Aired on Apr 07, 2016
  5. 19
    Available Aired on Mar 31, 2016
  6. 18
    Not Available Aired on Mar 10, 2016
  7. 17
    Available Aired on Feb 25, 2016
  8. 16
    Available Aired on Feb 18, 2016
  9. 15
    Available Aired on Feb 11, 2016
  10. 14
    Available Aired on Feb 04, 2016
  11. 13
    Available Aired on Jan 14, 2016
  12. 12
    Available Aired on Jan 07, 2016
  13. 10
    Available Aired on Dec 10, 2015
  14. 9
    Available Aired on Nov 19, 2015
  15. 8
    Available Aired on Nov 12, 2015
  16. 7
    Available Aired on Nov 05, 2015
  17. 6
    Not Available Aired on Oct 26, 2015
  18. 5
    Available Aired on Oct 19, 2015
  19. 4
    Available Aired on Oct 12, 2015
  20. 3
    Available Aired on Oct 05, 2015
  21. 1
    Available Aired on Sep 21, 2015
  1. 24
    Available Aired on May 07, 2015
  2. 22
    Available Aired on Apr 23, 2015
  3. 20
    Available Aired on Apr 09, 2015
  4. 19
    Available Aired on Apr 02, 2015
  5. 18
    Available Aired on Mar 12, 2015
  6. 17
    Available Aired on Mar 05, 2015
  7. 16
    Available Aired on Feb 26, 2015
  8. 15
    Available Aired on Feb 19, 2015
  9. 14
    Available Aired on Feb 05, 2015
  10. 13
    Available Aired on Jan 29, 2015
  11. 12
    Available Aired on Jan 08, 2015
  12. 11
    Available Aired on Dec 11, 2014
  13. 10
    Available Aired on Mar 09, 2015
  14. 9
    Available Aired on Mar 02, 2015
  15. 8
    Available Aired on Feb 23, 2015
  16. 7
    Available Aired on Feb 16, 2015
  17. 6
    Available Aired on Feb 09, 2015
  18. 5
    Available Aired on Feb 02, 2015
  19. 4
    Available Aired on Jan 26, 2015
  20. 3
    Available Aired on Jan 19, 2015
  21. 2
    Available Aired on Jan 12, 2015
  22. 1
    Available Aired on Jan 05, 2015
  1. 24
    Available Aired on May 15, 2014
  2. 23
    Available Aired on May 08, 2014
  3. 22
    Available Aired on May 01, 2014
  4. 21
    Available Aired on Apr 24, 2014
  5. 20
    Available Aired on Apr 10, 2014
  6. 19
    Available Aired on Apr 03, 2014
  7. 18
    Available Aired on Mar 13, 2014
  8. 17
    Available Aired on Mar 06, 2014
  9. 16
    Available Aired on Feb 27, 2014
  10. 15
    Available Aired on Feb 06, 2014
  11. 14
    Available Aired on Jan 30, 2014
  12. 13
    Available Aired on Jan 09, 2014
  13. 12
    Available Aired on Dec 31, 2013
  14. 11
    Available Aired on Dec 10, 2013
  15. 10
    Available Aired on Dec 04, 2013
  16. 9
    Available Aired on Nov 19, 2013
  17. 8
    Available Aired on Nov 12, 2013
  18. 7
    Available Aired on Nov 05, 2013
  19. 5
    Available Aired on Oct 15, 2013
  20. 4
    Available Aired on Oct 08, 2013
  21. 3
    Available Aired on Oct 01, 2013
  22. 2
    Available Aired on Sep 25, 2013
  23. 1
    Available Aired on Sep 25, 2013
  1. 23
    Available Aired on May 09, 2013
  2. 22
    Available Aired on May 02, 2013
  3. 21
    Available Aired on Apr 25, 2013
  4. 20
    Available Aired on Apr 04, 2013
  5. 19
    Available Aired on Mar 14, 2013
  6. 18
    Available Aired on Mar 07, 2013
  7. 17
    Available Aired on Feb 21, 2013
  8. 16
    Available Aired on Feb 14, 2013
  9. 15
    Available Aired on Feb 07, 2013
  10. 14
    Available Aired on Jan 31, 2013
  11. 13
    Available Aired on Jan 10, 2013
  12. 12
    Available Aired on Jan 03, 2013
  13. 11
    Available Aired on Dec 13, 2012
  14. 10
    Available Aired on Dec 06, 2012
  15. 9
    Available Aired on Nov 29, 2012
  16. 8
    Available Aired on Nov 15, 2012
  17. 5
    Available Aired on Oct 25, 2012
  18. 4
    Available Aired on Oct 18, 2012
  19. 2
    Available Aired on Oct 04, 2012
  1. 24
    Available Aired on May 10, 2012
  2. 23
    Available Aired on May 03, 2012
  3. 22
    Available Aired on Apr 26, 2012
  4. 21
    Available Aired on Apr 05, 2012
  5. 19
    Available Aired on Mar 08, 2012
  6. 18
    Available Aired on Feb 22, 2012
  7. 17
    Available Aired on Feb 16, 2012
  8. 16
    Available Aired on Feb 09, 2012
  9. 15
    Available Aired on Feb 02, 2012
  10. 12
    Available Aired on Jan 12, 2012
  11. 11
    Available Aired on Dec 08, 2011
  12. 10
    Available Aired on Nov 17, 2011
  13. 9
    Available Aired on Nov 10, 2011
  14. 7
    Available Aired on Oct 27, 2011
  15. 6
    Available Aired on Oct 20, 2011
  16. 5
    Available Aired on Oct 13, 2011
  17. 4
    Available Aired on Oct 06, 2011
  18. 3
    Available Aired on Sep 29, 2011
  19. 2
    Available Aired on Sep 22, 2011
  20. 1
    Available Aired on Sep 22, 2011
  1. 24
    Available Aired on May 19, 2011
  2. 23
    Available Aired on May 12, 2011
  3. 20
    Available Aired on Apr 07, 2011
  4. 19
    Available Aired on Mar 31, 2011
  5. 18
    Available Aired on Mar 10, 2011
  6. 17
    Available Aired on Feb 24, 2011
  7. 16
    Available Aired on Feb 17, 2011
  8. 15
    Available Aired on Feb 10, 2011
  9. 14
    Available Aired on Feb 03, 2011
  10. 13
    Available Aired on Jan 20, 2011
  11. 12
    Available Aired on Jan 06, 2011
  12. 11
    Available Aired on Dec 16, 2010
  13. 10
    Available Aired on Dec 09, 2010
  14. 9
    Available Aired on Nov 18, 2010
  15. 8
    Available Aired on Nov 11, 2010
  16. 7
    Available Aired on Nov 04, 2010
  17. 6
    Available Aired on Oct 28, 2010
  18. 5
    Available Aired on Oct 21, 2010
  19. 4
    Available Aired on Oct 14, 2010
  20. 3
    Available Aired on Oct 07, 2010
  21. 2
    Available Aired on Sep 30, 2010
  22. 1
    Available Aired on Sep 23, 2010
  1. 23
    Available Aired on May 24, 2010
  2. 22
    Available Aired on May 17, 2010
  3. 21
    Available Aired on May 10, 2010
  4. 20
    Available Aired on May 03, 2010
  5. 19
    Available Aired on Apr 12, 2010
  6. 18
    Available Aired on Mar 22, 2010
  7. 17
    Available Aired on Mar 08, 2010
  8. 15
    Available Aired on Feb 08, 2010
  9. 14
    Available Aired on Feb 01, 2010
  10. 13
    Available Aired on Jan 18, 2010
  11. 12
    Available Aired on Jan 11, 2010
  12. 11
    Available Aired on Dec 14, 2009
  13. 10
    Available Aired on Dec 07, 2009
  14. 9
    Available Aired on Nov 23, 2009
  15. 8
    Available Aired on Nov 16, 2009
  16. 7
    Available Aired on Nov 09, 2009
  17. 6
    Available Aired on Nov 02, 2009
  18. 5
    Available Aired on Oct 19, 2009
  19. 4
    Available Aired on Oct 12, 2009
  20. 3
    Available Aired on Oct 05, 2009
  21. 2
    Available Aired on Sep 28, 2009
  22. 1
    Available Aired on Sep 21, 2009
  1. 23
    Available Aired on May 11, 2009
  2. 22
    Available Aired on May 04, 2009
  3. 21
    Available Aired on Apr 27, 2009
  4. 20
    Available Aired on Apr 13, 2009
  5. 19
    Available Aired on Mar 30, 2009
  6. 18
    Available Aired on Mar 16, 2009
  7. 17
    Available Aired on Mar 09, 2009
  8. 16
    Available Aired on Mar 02, 2009
  9. 15
    Available Aired on Feb 09, 2009
  10. 14
    Available Aired on Feb 02, 2009
  11. 13
    Available Aired on Jan 19, 2009
  12. 12
    Available Aired on Jan 12, 2009
  13. 11
    Available Aired on Dec 15, 2008
  14. 10
    Available Aired on Dec 08, 2008
  15. 9
    Available Aired on Nov 24, 2008
  16. 8
    Available Aired on Nov 17, 2008
  17. 5
    Available Aired on Oct 20, 2008
  18. 4
    Available Aired on Oct 13, 2008
  19. 3
    Available Aired on Oct 06, 2008
  20. 2
    Available Aired on Sep 29, 2008
  21. 1
    Available Aired on Sep 22, 2008

Watch The Big Bang Theory season 10 episode 10 (S10E10)

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Sheldon and Leonard must divide up their possessions and remove Penny's things from 4B.

Watch The Big Bang Theory season 10 episode 9 (S10E09)

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When Bert, a Caltech geologist, wins the MacArthur Genius fellowship, Sheldon is overcome with jealousy. Also, Wolowitz finds an old remote control Stephen Hawking action figure he invented.

Watch The Big Bang Theory season 10 episode 8 (S10E08)

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After a successful experiment combining their genes, Sheldon will stop at nothing to convince Amy they should procreate. Also, Koothrappali is embarrassed to tell the gang what the new woman he’s dating does for a living.

Watch The Big Bang Theory season 10 episode 7 (S10E07)

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In order to continue living with Sheldon, Amy lies to him about repairs being made to her apartment and they host an "on location" episode of "Fun With Flags" in Penny’s apartment. Also, Leonard lets Penny decorate Sheldon’s old room after he learns that she has been secretly moving Leonard’s collectibles into storage.

Watch The Big Bang Theory season 10 episode 6 (S10E06)

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Watch The Big Bang Theory season 10 episode 5 (S10E05)

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Leonard and Penny must separate a quarreling Sheldon and Amy when their cohabitation does not go as planned, and Sheldon threatens to break off their relationship when Amy refuses to adhere to the bathroom schedule. Also, Howard and Bernadette find unexpected guests at their house when they decide to stay home from a planned vacation.

Watch The Big Bang Theory season 10 episode 4 (S10E04)

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When Amy’s apartment floods, she proposes a “cohabitation experiment” with Sheldon. Also, Howard and Bernadette are upset when Koothrappali learns the gender of the baby before they do.

Watch The Big Bang Theory season 10 episode 3 (S10E03)

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Tensions rise when the boys struggle to complete their government project on time and Sheldon tries an energy drink to stay awake. Also, Penny and Amy go to a “party” at Bert the geologist’s house, and Koothrappali learns Bernadette’s true feelings about her pregnancy when they clean out the future baby room.

Watch The Big Bang Theory season 10 episode 2 (S10E02)

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Colonel Williams, an Air Force representative from the Department of Material Command sits down to talk with Wolowitz.

Watch The Big Bang Theory season 10 episode 1 (S10E01)

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After Sheldon’s mother and Leonard's father share an evening together, everyone deals with an awkward morning the next day. Also, Penny’s family arrives for the wedding ceremony, including her anxiety-ridden mother, Susan, and her drug dealing brother, Randall.

Watch The Big Bang Theory season 9 episode 24 (S09E24)

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Chaos ensues when Leonard’s recently divorced parents, Alfred and Beverly, and Sheldon’s devoutly religious mother, Mary, come to town. Also, Wolowitz and Koothrappali think the government is out to get them when they are contacted about their guidance system.

Watch The Big Bang Theory season 9 episode 23 (S09E23)

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Sheldon hires Stuart to spend the day with Amy when he’d rather go to a movie screening. Also, Leonard’s mother, Beverly, comes to town and Penny struggles to make a connection with her.

Watch The Big Bang Theory season 9 episode 22 (S09E22)

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The gang goes to a wine bar and runs into Penny’s old boyfriend, Zack. Also, Bernadette gets stuck spending the evening with Sheldon when she can’t go wine tasting with the group, and things don’t go as planned when Koothrappali introduces his new girlfriend, Claire.

Watch The Big Bang Theory season 9 episode 20 (S09E20)

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Sheldon spills a secret of Leonard’s when the two take a weekend cabin trip with Penny and Amy. Also, when Koothrappali goes overboard with pregnancy gifts, Wolowitz and Bernadette must draw the line.

Watch The Big Bang Theory season 9 episode 19 (S09E19)

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Amy is shocked at a revelation from Sheldon after she buys him a new laptop. Also, Koothrappali sells out Leonard and Wolowitz after they lie to their wives in order to attend an early screening of a movie.

Watch The Big Bang Theory season 9 episode 18 (S09E18)

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Leonard, Sheldon, and Wolowitz run into problems when they file for a patent for their infinite persistence gyroscope. Also, Penny, Amy and Bernadette give Koothrappali dating advice when Emily reaches out to him after their breakup.

Watch The Big Bang Theory season 9 episode 17 (S09E17)

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After more than nine years together, the gang finally celebrates Sheldon’s birthday, surprising him with a special guest.

Watch The Big Bang Theory season 9 episode 16 (S09E16)

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When the gang finds out about Bernadette’s pregnancy, they celebrate by singing karaoke. Also, Bernadette is concerned when Wolowitz freaks out over her pregnancy announcement, and Wolowitz is convinced he must make more money to provide for the baby.

Watch The Big Bang Theory season 9 episode 15 (S09E15)

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Sheldon and Amy host a live Valentine's Day episode of Fun with Flags, Leonard and Penny grapple with getting older, Howard and Bernadette find a surprise in their hot tub and Raj is torn between Emily and the cute girl he met at the Comic Bookstore.

Watch The Big Bang Theory season 9 episode 14 (S09E14)

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Meemaw meets Amy, but it isn't all roses. Meemaw seems to have an axe to grind with her. Sheldon comes to Amy's defense, but not before Meemaw lets a little secret of his slip.

Watch The Big Bang Theory season 9 episode 13 (S09E13)

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After having to deal with a sick Sheldon, Leonard, Penny and the gang try to treat themselves to a Sheldon-free weekend.

Watch The Big Bang Theory season 9 episode 12 (S09E12)

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Penny gets more than she bargained for when Leonard agrees to meet with a psychiatrist on her behalf. Also, Sheldon and Koothrappali collaborate on an astronomical discovery, and Wolowitz and Bernadette can't believe what they are feeling after Stuart moves out.

Watch The Big Bang Theory season 9 episode 10 (S09E10)

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Sheldon has a revelation when he realizes why a song was stuck in his head. Also, Amy invites Dave over for dinner despite their previously awkward date, and Wolowitz and Koothrappali become obsessed with a fan of their band, "Footprints on the Moon".

Watch The Big Bang Theory season 9 episode 9 (S09E09)

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Sheldon and Amy try hanging out as friends when they spend Thanksgiving together at the aquarium. Also, Wolowitz reluctantly agrees to volunteer at the soup kitchen with Bernadette, Raj and Emily, and Penny discovers that Leonard knows more about her than she thought.

Watch The Big Bang Theory season 9 episode 8 (S09E08)

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Sheldon, Wolowitz and Koothrappali post an online advertisement to find Sheldon a new girlfriend. Also, when Amy is coy with details about a guy she is dating, Penny and Bernadette decide to spy

Watch The Big Bang Theory season 9 episode 7 (S09E07)

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Wil Wheaton interviews Sheldon for a Star Trek documentary where he reveals the ring and his plan to propose to Amy. Bernadette wants to start renovating the house and the topic of starting a family together with Howard is brought up.

Watch The Big Bang Theory season 9 episode 6 (S09E06)

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In the midst of a nation-wide helium shortage, Sheldon and Leonard take desperate measures to get the supplies they need. Also, Penny and Bernadette download a dating app on Amy's phone to try and find her a new man.

Watch The Big Bang Theory season 9 episode 5 (S09E05)

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The guys take a fencing lesson from Barry Kripke and Sheldon finds himself in an awkward position when Kripke expresses interest in Amy. Also, when Stuart struggles to get female customers at the Comic Book Store, Penny, Amy and Bernadette come by to help him out.

Watch The Big Bang Theory season 9 episode 4 (S09E04)

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Sheldon learns of an impending change in his living arrangements and decides to revert back to 2003, a simpler time before he met Leonard and Penny. Also, Howard and Raj form a band to play at the Comic Book Store.

Watch The Big Bang Theory season 9 episode 3 (S09E03)

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The guys' science skills are put to the test when they get a flat tire during Leonard's bachelor party weekend in Mexico. Also, the girls force Penny to finally tell her family that she eloped with Leonard.

Watch The Big Bang Theory season 9 episode 1 (S09E01)

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After driving to Vegas to get married, Penny struggles with Leonard’s confession that he kissed another girl. Also, Sheldon doesn't know how to act after Amy pushes pause on their relationship.

Watch The Big Bang Theory season 8 episode 24 (S08E24)

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Sheldon pushes Leonard and Penny to choose a date for their wedding and deals with dramatic changes in his own relationship with Amy.

Watch The Big Bang Theory season 8 episode 22 (S08E22)

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Wolowitz questions his engineering abilities when he and Sheldon can’t get a toy drone to fly. Meanwhile, a cancelled flight nearly prevents Leonard from giving the commencement address at his former high school, and Raj pits his parents against each other when his father cuts him off financially.

Watch The Big Bang Theory season 8 episode 20 (S08E20)

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When Sheldon and Amy build a blanket fort, they come to major crossroads in their relationship. Also, Wolowitz meets the half-brother he never knew he had, and when Penny is invited to appear on Wil Wheaton’s podcast, she and Leonard have a huge, on-air argument.

Watch The Big Bang Theory season 8 episode 19 (S08E19)

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When Leonard and Sheldon are invited to speak at UC Berkeley, they take a detour to try to meet an idol. Also, when Bernadette and Howard battle over the fate of his Doctor Who TARDIS, Raj and Amy offer to settle the dispute with a game of ping pong.

Watch The Big Bang Theory season 8 episode 18 (S08E18)

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Friction ensues when a magazine fails to mention Leonard in an article about the paper he co-wrote with Sheldon. Also, a blackout at Mrs. Wolowitz’s home leads to a final family dinner in her honor.

Watch The Big Bang Theory season 8 episode 17 (S08E17)

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Trouble arises when Amy learns Sheldon has applied for a one-way mission to colonize Mars. Also, a trip to the pet store ends in a fight for Sheldon and Amy, Leonard surprises Penny with a very “adult” purchase, and Raj is caught snooping in Emily’s apartment.

Watch The Big Bang Theory season 8 episode 16 (S08E16)

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As a joke, Sheldon and Penny try an experiment designed to make participants fall in love. Also, Leonard, Amy, Raj and Emily spend the evening trying to escape a room with a “zombie.” And, after returning from Mrs. Wolowitz’ funeral, Bernadette and Howard run into trouble at the airport.

Watch The Big Bang Theory season 8 episode 15 (S08E15)

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Wolowitz receives some shocking news as everyone prepares for the reopening of Stuart’s comic book store. Penny teaches Sheldon how to “let it go,” but can’t follow her own advice after she learns something infuriating about Amy. Also, Leonard and Raj think they spot Nathan Fillion at a restaurant.

Watch The Big Bang Theory season 8 episode 14 (S08E14)

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Leonard and Sheldon publish a paper which is widely accepted except for comments from an internet troll. Meanwhile, the girls reminisce about embarassing incidents from their past.

Watch The Big Bang Theory season 8 episode 13 (S08E13)

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The gang tries to help Sheldon when he becomes stuck in a rut at work by increasing his anxiety level. Howard teases Raj with a new game called "Cinnamon or Emily?"

Watch The Big Bang Theory season 8 episode 12 (S08E12)

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Wolowitz tries to distract Raj, who is anxiously awaiting data from a space probe he helped launch. Meanwhile, Sheldon and Leonard go dress shopping with Penny and Amy.

Watch The Big Bang Theory season 8 episode 11 (S08E11)

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Leonard and Howard turn to Raj for help in dealing with a work emergency when they nearly come to blows after blaming each other for a potential disaster at the university. Amy throws an authentic Victorian Christmas party, while Sheldon seeks revenge on her for making him celebrate the holidays.

Watch The Big Bang Theory season 8 episode 10 (S08E10)

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While Sheldon says a tearful goodbye to the final installment of "Fun with Flags", Leonard, Howard and Raj search for something significant in a dead professor's research. And Bernadette is shocked to learn of her co-workers’ true feelings from Penny.

Watch The Big Bang Theory season 8 episode 9 (S08E09)

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When Leonard gets minor surgery on his nose, Sheldon is the one in need of sympathy. Meanwhile, Raj's parents' impending divorce causes Howard and Bernadette to work on their own marriage.

Watch The Big Bang Theory season 8 episode 8 (S08E08)

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When the gang recreates a high-school prom night on the roof of the guys'; apartment building, Sheldon feels pressure to participate in all the typical romantic traditions.

Watch The Big Bang Theory season 8 episode 7 (S08E07)

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The guys try to help Penny out of an awkward work dilemma, when a smitten doctor shows up at her door after her flirtatious sales techniques work a little too well. Meanwhile, Amy and Bernadette argue over whether or not female scientists should play up their sexuality.

Watch The Big Bang Theory season 8 episode 6 (S08E06)

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Sheldon and Raj test whether they could survive a dark-matter research expedition in a salt mine by simulating the conditions in a steam tunnel deep underground. Leonard and Penny seek advice from Howard and Bernadette after they fight about money.

Watch The Big Bang Theory season 8 episode 5 (S08E05)

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During their weekend in Las Vegas, Bernadette and Amy accuse Penny of being a buzz kill. The guys try to invent the next big thing.

Watch The Big Bang Theory season 8 episode 4 (S08E04)

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Raj's honesty comes back to haunt him when his new girlfriend is unfriendly to Penny. The guys think about becoming part owners in Stuart's store.

Watch The Big Bang Theory season 8 episode 3 (S08E03)

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Wolowitz feels nervous when he is asked to throw the first pitch at a Los Angeles Angels game. Penny and Leonard want to prove Sheldon wrong after he says he and Amy are the better couple.

Watch The Big Bang Theory season 8 episode 2 (S08E02)

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When Sheldon must teach a class, Howard decides to take it. Amy takes advantage of the tension between Penny and Bernadette.

Watch The Big Bang Theory season 8 episode 1 (S08E01)

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Leonard and Amy make an unexpected trip to Arizona to fetch Sheldon; Penny interviews for a job at Bernadette's company; Stuart's relationship with Mrs. Wolowitz disturbs Howard.

Watch The Big Bang Theory season 7 episode 24 (S07E24)

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Sheldon get upset about his career, the destruction of the comic book store and Leonard and Penny's future living arrangements. Howard and Bernadette can't keep hold of a carer for his mother. With his entire world changing around him, Sheldon considers a major move.

Watch The Big Bang Theory season 7 episode 23 (S07E23)

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A bad day causes Penny to reevaluate her life choices – including Leonard. Meanwhile, Howard and Bernadette struggle to care for Mrs. Wolowitz, and Raj gets relationship advice from Sheldon.

Watch The Big Bang Theory season 7 episode 22 (S07E22)

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As the gang celebrates Star Wars Day, Sheldon discovers he is having difficulty dealing with the death of Professor Proton.

Watch The Big Bang Theory season 7 episode 21 (S07E21)

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To prepare for a date with Emily, Howard acclimates Raj to horror movies. Penny and Sheldon are upset when they discover Amy and Bernadette lied to avoid hanging out with them.

Watch The Big Bang Theory season 7 episode 20 (S07E20)

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Sheldon faces a personal crisis after deciding he’s wasting his time with string theory. Meanwhile, a double date between Raj, Emily and the Wolowitzes ends in embarrassment for Howard.

Watch The Big Bang Theory season 7 episode 19 (S07E19)

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While Raj is wracked with guilt when he tries to date two women at once, Penny wrestles with whether to take a role in a cheesy movie and Sheldon is torn trying to choose between two gaming systems.

Watch The Big Bang Theory season 7 episode 18 (S07E18)

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When Sheldon visits his Mom in Houston, he is forced to confront a new reality. Meanwhile, Raj’s ‘Murder Mystery’ party starts some fights within the gang.

Watch The Big Bang Theory season 7 episode 17 (S07E17)

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Bernadette tries to negotiate peace between Sheldon and Wolowitz; Penny receives an embarrassing offer; Raj wants Amy to write to a woman on his behalf.

Watch The Big Bang Theory season 7 episode 16 (S07E16)

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Leonard buys a dining room table and it causes Sheldon to reevaluate the changes in his life. Meanwhile, Wolowitz is offered a chance to go back to space and Bernadette struggles with whether or not to encourage him.

Watch The Big Bang Theory season 7 episode 15 (S07E15)

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Sheldon and Amy go on a trip to wine country with Howard and Bernadette; Penny and Leonard rush Raj's dog to the vet.

Watch The Big Bang Theory season 7 episode 14 (S07E14)

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After the guys can’t get Comic-Con tickets, Sheldon tries to hold his own convention and winds up spending a wild night with James Earl Jones. Meanwhile, the girls see if they can act like “grown-ups”.

Watch The Big Bang Theory season 7 episode 13 (S07E13)

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Sheldon tries to relax after he is forced to take a vacation. Meanwhile, Leonard struggles to be supportive of Penny after she quits her job, and Bernadette seeks Stuart’s help in replacing one of Howard’s comic books.

Watch The Big Bang Theory season 7 episode 12 (S07E12)

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When Penny’s big acting break on NCIS is a bust, Leonard struggles to help her, which results in Penny asking Leonard a bold relationship question. Meanwhile, Sheldon tries to learn how to be funny and Raj tries to work on his “game” before talking to girls.

Watch The Big Bang Theory season 7 episode 11 (S07E11)

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While Sheldon is in Texas, the rest of the gang realizes how much he has changed their lives as they decorate the apartment Christmas tree.

Watch The Big Bang Theory season 7 episode 10 (S07E10)

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Leonard and Amy help Sheldon cope with the shame he’s feeling after his accidental contribution to science is disproved. Meanwhile, Raj must stay with Howard and Bernadette for a week.

Watch The Big Bang Theory season 7 episode 9 (S07E09)

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Sheldon protests when the gang drags him to Mrs. Wolowitz’s house for Thanksgiving. Meanwhile, Penny and Leonard must deal with a mistake from her past.

Watch The Big Bang Theory season 7 episode 8 (S07E08)

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When a mistake comes to light, Sheldon makes Leonard walk a mile in his shoes; Penny decides to confront Raj's ex.

Watch The Big Bang Theory season 7 episode 7 (S07E07)

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When Professor Proton asks Leonard for help with an experiment, Sheldon retaliates by befriending Proton's rival, Bill Nye.

Watch The Big Bang Theory season 7 episode 5 (S07E05)

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Amy starts working at Caltech which causes friction with Sheldon. Howard agrees with Sheldon who mentions this to Bernadette causing a big fight for the Wolowitzes.

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Beverly Hofstadter writes a psychology book about Leonard which Penny buys and reads. Sheldon wants to ruin something for Amy after she ruins an Indiana Jones movie for him. Raj and Stuart try online dating.

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When the entire gang competes in a scavenger hunt designed by Raj, it brings out the best - and worst - in everyone.

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Leonard and Sheldon's friendship is tested; Wolowitz's relationship with his mom causes a threat to his masculinity.

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With Leonard away, Sheldon and Penny spend quality time together sharing intimate secrets. Also, Wolowitz helps Raj get over his ex-girlfriend.

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Amy and Sheldon's relationship takes a surprising turn during a game of "Dungeons & Dragons"; Lucy and Koothrappali have an awkward date.

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Leonard and Sheldon hire the host (Bob Newhart) of their favorite childhood TV show to perform; Bernadette and Howard run into trouble while dog-sitting for Raj's pet.

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Amy tries to help Sheldon get over his compulsive need for closure when one of his favorite TV shows is canceled; Raj discovers a secret about Lucy.

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The girls get involved when Leonard, Sheldon and Raj compete for tenure at the University.

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Howard considers whether or not he should open a letter from his father; Penny and Leonard host a "grown-up" cocktail party.

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Leonard, Sheldon and Wolowitz talk to junior high girls about science-related careers; Raj plans a date with Lucy.

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After a bad date, Koothrappali decides to never leave his apartment; Penny's acting skills impress Sheldon.

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The guys search for a perfect Valentine's Day gift for their significant others; Stuart and Raj host a "lonely people" party at the comic book store.

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A fight between Sheldon and Leonard impacts Amy and Penny's living arrangements; while Howard is away, Raj helps Mrs. Wolowitz out.

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Sheldon faces a crisis of confidence when he is forced to work with his nemesis, Barry Kripke; Raj and Howard buy expensive action figures of themselves.

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As the guys don costumes and go on a road trip to a comic book convention, the ladies decide to stay home and try to interpret a comic book.

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When Sheldon is accused of sexual harassment, he ends up getting Raj, Leonard and Wolowitz in trouble.

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During a game, Sheldon revisits Christmas memories; Amy, Penny and Bernadette look for a date for Koothrappali.

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When Amy gets sick, Sheldon tries to nurse her back to health; Wolowitz and his father-in-law plan a fishing trip.

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When the University reassigns Sheldon’s parking spot to Wolowitz, their fight affects the whole gang.

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Raj and Howard try to to figure out why Sheldon disappears at 2:45 every afternoon; jealousy arises in Penny and Leonard's relationship.

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The gang celebrates Halloween at Stuart’s comic book store. Meanwhile, Leonard seduces Penny with science.

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When Wolowitz returns from space, he doesn’t get the hero’s welcome he expected. Meanwhile, Game Night turns into a battle of the sexes.

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When Sheldon learns that Penny is thinking about breaking up with Leonard, he tries to intervene. Meanwhile, in space, the other astronauts pick on Howard.

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The fifth season ends with Howard and Bernadette deciding to get married before his NASA mission, causing the gang to scurry into overdrive in an effort to stage the wedding. NASA astronaut Mike Massimino has a cameo as himself.

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When NASA moves up Howard's mission, he must face his fears and Bernadette's dad, thus putting the wedding plans in jeopardy. Meanwhile, Leonard says something surprising to Penny in the bedroom.

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After the guys throw Howard a bachelor party, Bernadette reconsiders marrying him after learning about his sexual history.

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When Wolowitz gets to work with Stephen Hawking, Sheldon is willing to do anything to meet his hero.

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Sheldon must choose between joining Amy at her aunt's birthday party or playing videogames all weekend with the guys.

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Sheldon becomes agitated when his regular barber is out sick. Astronaut training causes Howard to reconsider wanting to go into space. Penny beats Leonard in chess, the first time she plays.

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Penny is horrified when Amy gives her a gift: a huge, quite horrible painting of the two of them. With no good way to avoid displaying it, she only hangs it up when Amy is over. When Amy catches her taking the painting down, she's embarrassed and angry until Penny lies and says the gift made Bernadette jealous. When the deranged Professor Rothman is forced to retire, both Sheldon and Kripke vie for his office. President Siebert refuses to resolve the dispute, so Leonard arranges a one-on-one basketball game to decide (since they're both equally bad at sports). Neither one can even make a single basket, so they end up deciding by seeing who can bounce the ball the highest. Sheldon wins; unfortunately, the office is not what he'd hoped for: the thermostat is located in the office of a professor going through the hot flashes of menopause (thus Sheldon is too cold), the mockingbird outside his window is off-key with the annoying windchimes, the perpetually naked Professor Rothman refuses to vacate, and the Geology Department upstairs makes too much noise. Finally, Sheldon gets his head stuck in the wall in an existing hole, after which Leonard takes his picture before he goes for help.

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When Sheldon is forced to take his vacation, he goes to work with Amy in her neurobiology lab.

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Sheldon's selfish demands force Leonard to reconsider their friendship. Meanwhile, Wolowitz tries to pick his astronaut nickname.

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Sheldon gets in trouble with Amy when he isn't impressed by her recent accomplishment, and Howard must come to grips with Bernadette's dislike of children.

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Leonard must face his fears after being contacted by his high school tormentor.

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"The Flaming Spittoon Acquisition" is the tenth episode of the fifth season of The Big Bang Theory that first aired on CBS on November 17, 2011. It is the ninety-seventh episode overall.

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Leonard and Penny try hanging out as friends on a 'non-date', but end up purposely ruining each others chances with perspective dates. Meanwhile, Sheldon enlists the help of Bernadette and Amy to overcome his fear of birds.

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A cute comic book artist puts Leonard and Priya’s relationship to the test, while Sheldon tries to scare the guys for Halloween.

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Sheldon's mother, Mary Cooper, comes to visit, but Sheldon is annoyed that she also spends time with the rest of the gang, instead of catering to his every demand.

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Sheldon and Leonard get invited to a party at Wil Wheaton's house, and Howard gets an out-of-this-world opportunity.

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Penny plays Matchmaker for Raj, which results in him finding a girl he is comfortable talking to.

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Leonard and Amy get to know each other better, while Howard and Bernadette spend the weekend with Mrs. Wolowitz.

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A fight between Sheldon and Penny leaves Amy caught in the middle, while Leonard tries to spice up his long-distance relationship with Priya.

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Penny is worried with how damaged her friendship with the guys will be in the aftermath of her sleeping with Raj while Sheldon becomes the leader of the paintball team.

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When Bernadette receives her PhD, Wolowitz feels emasculated. Raj and Leonard swap places and Penny does something she's regrets.

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When Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital.

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Sheldon and Amy decide to start several rumors about the others as a test. Meanwhile, Howard takes his relationship with Bernadette to even higher level.

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Sheldon's World of Warcraft online game account is hacked and he is determined to find out who did it. Also Penny shares some girl talk with her friends about Leonard and his new girlfriend. When Howard discovers who hacked the account, the guys depart for a quest to Carlsbad, California where the hacker, Todd Zarnecki, lives in order to retrieve the stolen account, along with "enchanted weapons, gladiator armor, gold, and a battle ostrich, Glenn". Despite Sheldon carrying his Bat'leth with him they fail miserably. On the way back their car engine breaks down, and they're saved by Penny, who came to drive them home and upon hearing about their failure promises to show them "How we finish quests in Nebraska" and forces Zarnecki to give up kicking him below waist.

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Sheldon is baffled by Wolowitz's magic trick. Meanwhile, Leonard realizes dating Priya may make it impossible to continue being friends with Penny.

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Sheldon becomes concerned when everybody begins to hang out at Raj's apartment and discovers Leonard is the center of the group.

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As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister.

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A wealthy donor to the university makes Leonard consider how far he's willing to go for the sake of science.

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Hoping it will make him a better teacher, Sheldon has Penny give him acting lessons. Raj has fantasies about a friend's girlfriend.

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Bernadette runs into her ex-boyfriend while attending a science event with Wolowitz.

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Leonard's idea for a smartphone app derails his friendship with Sheldon.

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The guys find a "super" use for Penny's new boyfriend, Zack, when they enter a costume contest as the Justice League.

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Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.

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Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.

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While the guys camp in line for a long-awaited movie screening, Penny and Bernadette invite Amy to her first slumber party.

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Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.

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Leonard keeps an affair a secret from Sheldon, Howard and Raj.

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Leonard realizes he’s the only one without a girlfriend, while Sheldon wants to get rid of his.

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An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.

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The guys are concerned as Sheldon searches for an alternative to human companionship.

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Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.

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Penny tags along on Sheldon's first ever date; Wolowitz finds a new use for a robotic arm.

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While Penny worries that dating Leonard has ruined her for normal guys, Wolowitz and Koothrappali search for Sheldon's perfect match online.

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Leonard tells Penny about how he met Sheldon for the first time...and what happened to the elevator.

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Leonard and Sheldon compete for the attention of a famous female physicist.

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When Leonard and Penny aren't speaking, Sheldon goes to extremes to keep them both happy.

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A fight between Leonard and Penny threatens their relationship, while Sheldon battles Wil Wheaton in bowling.

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Sheldon's friends come to his aid when his fear of public speaking stands between him and a coveted award.

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When the guys find a ring from "The Lord of the Rings" at a garage sale, it threatens to tear them apart.

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Leonard can only bring one guest on a trip to see CERN's Large Hadron Collider (the world's largest and highest energy particle accelerator) in Switzerland on Valentine's Day.

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Sheldon's search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.

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When their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.

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Leonard is aghast to find out a secret of Penny's: she believes in psychics. Meanwhile, Sheldon tries to assist Koothrappali in picking up a girl at a university mixer.

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A Christmas visit from his mother has Leonard discovering she's kept a lot of news from him that she shares with Sheldon and worrying if she'll approve of his romance with Penny.

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Penny gets help from Sheldon in order to understand what Leonard's work is, while Wolowitz develops a jealousy when Leonard starts hanging out with his new girlfriend.

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After he's humiliated on National Public Radio, Sheldon vows to destroy Kripke, while Wolowitz tries not to destroy his new relationship with Bernadette.

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With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely on.

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A squabble between Leonard and Penny sees Sheldon playing mediator, though out of his own incovenience from the sitiation rather than altruism.

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Sheldon becomes Leonard's teacher in order to understand football, while an incident with flying a kite threatens Howard and Raj's friendship.

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After overhearing that Wil Wheaton is entering a trading-card competition, Sheldon decides to enter it himself. Meanwhile, Penny sets up one of her friends on a date with Wolowitz.

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Raj must find a new job or be sent back to India, but Sheldon has a solution, which leaves Leonard and Penny dealing with Howard as a third wheel.

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Howard and Raj visit a Goth nightclub to pick up women while Sheldon attempts to build a better Penny using chocolate-based behavior modification.

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Leonard and Penny struggle to recover from an awkward first hookup while Sheldon and Howard stake their best comic books on a bet to determine the species of a cricket.

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When Sheldon learns the guys tampered with his expedition data he got from the arctic, he leaves to Texas in disgrace. This results in the guys following him, which threatens Leonard's hope for some romantic time with Penny and the guys' friendship with Sheldon.

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The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.

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Penny's second date with Stuart sees her making a comment that gives Leonard new hope for a relationship with her. Wolowitz realizes there's a crucial error in a NASA project he's working on.

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Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.

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A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.

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Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."

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Penny's home business turns into a complete nightmare when Sheldon takes over.

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Leonard, Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress (Summer Glau) is on board the train they are taking to San Francisco.

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A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.

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Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.

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Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.

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Sheldon creates a scientific procedure for making friends.

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Penny's criticism of Wolowitz's romantic life pushes him into depression and AWOL for a fighting robot battle the rest of guys are depending on him for.

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Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.

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Leonard asks Penny for advice when his new relationship starts moving too fast.

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Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.

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Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.

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Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.

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Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.

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Sheldon creates a monster when he introduces Penny to online gaming.

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A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.

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Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.

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Penny's break-up spurs Leonard to summon the courage to ask her out, and each goes to Sheldon for advice on their upcoming date.

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Penny wants to throw a surprise party for Leonard, but Sheldon's indulgence at an electronics store throws her off-track.

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The rest of the gang fall for Sheldon's twin sister, and Leonard's plan to win her heart is derailed when Sheldon declares he'll be the one to decide who can date her.

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When delivery of another collectible leads to Penny's lashing out at Leonard, he decides it's time to give up his habit, much to his friends' protestation.

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Sheldon finds himself booted from the gang's Physics Bowl team and replaced with Leslie, so he forms his own team, hoping to prove he's superior.

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With Sheldon rattled over meeting Dennis, a 15-year-old physicist who's smarter than he, Leonard helps him look for a way to debunk Dennis's research.

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With his friends knowing how sour he acts when sick—and avoiding him as a result—Sheldon is nursed by Penny, who hasn't a clue what she's in for.

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Leonard and Sheldon each lie to avoid seeing Penny's concert, but Sheldon's is a bit too complicated for his own good.

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When they're invited to present at a physics conference, Sheldon's reluctance to share the credit leads to a tiff between him and Leonard, and Penny's intervention only exacerbates the situation.

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Raj's parents set him up on a blind date, but just when he discovers he can talk to her, she shows interest in Sheldon.

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With Wolowitz AWOL with one of her friends, Penny's recruited to fill in for him on the guys' Halo team

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Penny hosts a Hallowe'en party, putting Leonard, Sheldon, Wolowitz, and Koothrappali through a new test of their social skills.

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Fearing he's wasting his time on Penny, Leonard ends up making a connection with Leslie.

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Sheldon's getting fired forces him to explore what life has to offer outside physics, leaving Leonard to take drastic action to snap his friend out of his funk.

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Leonard volunteers to sign for a package in an attempt to make a good impression on Penny, but when he enlists Sheldon for help, his attempt at chivalry goes terribly awry.

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Brilliant physicist roommates Leonard and Sheldon meet their new neighbor Penny, who begins showing them that as much as they know about science, they know little about actual living.

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How to watch The Big Bang Theory online without downloading

  1. Watch The Big Bang Theory online only at TVRill for free. No download or registration required.
  2. The Big Bang Theory first started airing on Sep 24, 2007 and we have updated 194 out of 196 aired episodes and we will add more as they air.
  3. Please note that new The Big Bang Theory episodes can take upto 2 days to be updated after their first airing date.
  4. To watch The Big Bang Theory episodes, select the season and episodes from the list above and the proper episode information will appear on the right side (or below in case of mobile devices), click on the watch now button below the episode info to go to episode page, and watch the respective episode without downloading.

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