The Big Bang Theory : Season 5

    • Air date: 22 Sep '11 24 episodes
      The geniuses of The Big Bang Theory get thrown for a bell curve in all 24 episodes of the phenomenally funny fifth season of the hit show. In season five, Penny and Leonard's relationship is relaunched in full "beta test" mode, while Sheldon, Howard, and Raj discover the feminine mystique is something that cannot be easily graphed or calculated. As Sheldon makes begrudging amendments to his "Relationship Agreement" with his "friend-who-happens-to-be-a-girl" Amy Farrah Fowler, Raj contemplates an arranged marriage, and Howard is all-systems-go for both is NASA space launch and wedding to the spirited Bernadette.
  • List of Episodes (24)

    1. The Skank Reflex Analysis

    • 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.

    2. The Infestation Hypothesis

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

    3. The Pulled Groin Extrapolation

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

    4. The Wiggly Finger Catalyst

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

    5. The Russian Rocket Reaction

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

    6. The Rhinitis Revelation

    • 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.

    7. The Good Guy Fluctuation

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

    8. The Isolation Permutation

    • Amy becomes heartbroken when she discovers that Penny and Bernadette went wedding dress shopping without her.

    9. The Ornithophobia Diffusion

    • 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.

    10. The Flaming Spittoon Acquisition

    • "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.

    11. The Speckerman Recurrence

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

    12. The Shiny Trinket Maneuver

    • 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.

    13. The Recombination Hypothesis

    • Leonard, who broke up with Priya, asks Penny out to a spur-of the-moment romantic dinner for two, and the duo contemplates on their relationship.

    14. The Beta Test Initiation

    • Leonard and Penny deal with the idea of starting a relationship again and Raj finally finds a "woman" he can talk to without being drunk, in the form of Siri on his new phone. Meanwhile, Sheldon decides to start a YouTube series entitled "Sheldon Cooper presents Fun with Flags" with the help of Amy.

    15. The Friendship Contraction

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

    16. The Vacation Solution

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

    17. The Rothman Disintegration

    • 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 ba

    18. The Werewolf Transformation

    • 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.

    19. The Weekend Vortex

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

    20. The Transporter Malfunction

    • Penny buys Leonard and Sheldon “Star Trek” collectibles as a thank-you, leading Sheldon to be haunted by Mr. Spock. Meanwhile, Raj decides he has met the “Future Mrs. Koothrappali” after his parents set him up on a date.

    21. The Hawking Excitation

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

    22. The Stag Convergence

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

    23. The Launch Acceleration

    • 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.

    24. The Countdown Reflection

    • 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.