Season 5
24 episodes · Sep 22, 2011
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.
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S5E1The Skank Reflex Analysis
Sep 22, 201121mPenny 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.
S5E2The Infestation Hypothesis
Sep 22, 201120mA fight between Sheldon and Penny leaves Amy caught in the middle, while Leonard tries to spice up his long-distance relationship with Priya.
S5E3The Pulled Groin Extrapolation
Sep 29, 201120mLeonard and Amy get to know each other better, while Howard and Bernadette spend the weekend with Mrs. Wolowitz.
S5E4The Wiggly Finger Catalyst
Oct 6, 201120mPenny plays Matchmaker for Raj, which results in him finding a girl he is comfortable talking to.
S5E5The Russian Rocket Reaction
Oct 13, 201121mSheldon and Leonard get invited to a party at Wil Wheaton's house, and Howard gets an out-of-this-world opportunity.
S5E6The Rhinitis Revelation
Oct 20, 201121mSheldon'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.
S5E7The Good Guy Fluctuation
Oct 27, 201120mA cute comic book artist puts Leonard and Priya’s relationship to the test, while Sheldon tries to scare the guys for Halloween.
S5E8The Isolation Permutation
Nov 3, 201121mAmy becomes heartbroken when she discovers that Penny and Bernadette went wedding dress shopping without her.
S5E9The Ornithophobia Diffusion
Nov 10, 201121mLeonard 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.
S5E10The Flaming Spittoon Acquisition
Nov 17, 201121mWhen Stuart asks Amy out on a date, Sheldon must confront his feelings and consider where his relationship with Amy is going.
S5E11The Speckerman Recurrence
Dec 8, 201120mLeonard must face his fears after being contacted by his high school tormentor.
S5E12The Shiny Trinket Maneuver
Jan 12, 201221mSheldon 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.
S5E13The Recombination Hypothesis
Jan 19, 201221mLeonard, 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.
S5E14The Beta Test Initiation
Jan 26, 201220mLeonard 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.
S5E15The Friendship Contraction
Feb 2, 201220mSheldon's selfish demands force Leonard to reconsider their friendship. Meanwhile, Wolowitz tries to pick his astronaut nickname.
S5E16The Vacation Solution
Feb 9, 201221mWhen Sheldon is forced to take his vacation, he goes to work with Amy in her neurobiology lab.
S5E17The Rothman Disintegration
Feb 16, 201221mSheldon battles Kripke for a coveted office at the university. Penny receives a very unusual gift from Amy.
S5E18The Werewolf Transformation
Feb 23, 201221mSheldon 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.
S5E19The Weekend Vortex
Mar 8, 201220mSheldon must choose between joining Amy at her aunt's birthday party or playing videogames all weekend with the guys.
S5E20The Transporter Malfunction
Mar 29, 201221mPenny 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.
S5E21The Hawking Excitation
Apr 5, 201219mWhen Wolowitz gets to work with Stephen Hawking, Sheldon is willing to do anything to meet his hero.
S5E22The Stag Convergence
Apr 26, 201221mAfter the guys throw Howard a bachelor party, Bernadette reconsiders marrying him after learning about his sexual history.
S5E23The Launch Acceleration
May 3, 201221mWhen 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.
S5E24The Countdown Reflection
May 10, 201220mThe 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.