The Big Bang Theory (2007)
Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.
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Episode 1 - The Skank Reflex Analysis
Release Date: 2011-09-22Penny 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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Episode 2 - The Infestation Hypothesis
Release Date: 2011-09-22A 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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Episode 3 - The Pulled Groin Extrapolation
Release Date: 2011-09-29Leonard and Amy get to know each other better, while Howard and Bernadette spend the weekend with Mrs. Wolowitz.
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Episode 4 - The Wiggly Finger Catalyst
Release Date: 2011-10-06Penny plays Matchmaker for Raj, which results in him finding a girl he is comfortable talking to.
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Episode 5 - The Russian Rocket Reaction
Release Date: 2011-10-13Sheldon 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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Episode 6 - The Rhinitis Revelation
Release Date: 2011-10-20Sheldon'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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Episode 7 - The Good Guy Fluctuation
Release Date: 2011-10-27A 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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Episode 8 - The Isolation Permutation
Release Date: 2011-11-03Amy becomes heartbroken when she discovers that Penny and Bernadette went wedding dress shopping without her.
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Episode 9 - The Ornithophobia Diffusion
Release Date: 2011-11-10Leonard 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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Episode 10 - The Flaming Spittoon Acquisition
Release Date: 2011-11-17When Stuart asks Amy out on a date, Sheldon must confront his feelings and consider where his relationship with Amy is going.
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Episode 11 - The Speckerman Recurrence
Release Date: 2011-12-08Leonard must face his fears after being contacted by his high school tormentor.
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Episode 12 - The Shiny Trinket Maneuver
Release Date: 2012-01-12Sheldon 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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Episode 13 - The Recombination Hypothesis
Release Date: 2012-01-19Leonard, 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.
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Episode 14 - The Beta Test Initiation
Release Date: 2012-01-26Leonard 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.
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Episode 15 - The Friendship Contraction
Release Date: 2012-02-02Sheldon's selfish demands force Leonard to reconsider their friendship. Meanwhile, Wolowitz tries to pick his astronaut nickname.
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Episode 16 - The Vacation Solution
Release Date: 2012-02-09When Sheldon is forced to take his vacation, he goes to work with Amy in her neurobiology lab.
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Episode 17 - The Rothman Disintegration
Release Date: 2012-02-16Sheldon battles Kripke for a coveted office at the university. Penny receives a very unusual gift from Amy.
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Episode 18 - The Werewolf Transformation
Release Date: 2012-02-23Sheldon 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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Episode 19 - The Weekend Vortex
Release Date: 2012-03-08Sheldon must choose between joining Amy at her aunt's birthday party or playing videogames all weekend with the guys.
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Episode 20 - The Transporter Malfunction
Release Date: 2012-03-29Penny 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.
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Episode 21 - The Hawking Excitation
Release Date: 2012-04-05When Wolowitz gets to work with Stephen Hawking, Sheldon is willing to do anything to meet his hero.
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Episode 22 - The Stag Convergence
Release Date: 2012-04-26After the guys throw Howard a bachelor party, Bernadette reconsiders marrying him after learning about his sexual history.
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Episode 23 - The Launch Acceleration
Release Date: 2012-05-03When 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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Episode 24 - The Countdown Reflection
Release Date: 2012-05-10The 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.