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The Big Bang Theory Season 5

The Skank Reflex Analysis
Episode 1
Air Date: Sep 22, 2011

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 l…

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The Infestation Hypothesis
Episode 2
Air Date: Sep 22, 2011

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…

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The Pulled Groin Extrapolation
Episode 3
Air Date: Sep 29, 2011

The Pulled Groin Extrapolation

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

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The Wiggly Finger Catalyst
Episode 4
Air Date: Oct 6, 2011

The Wiggly Finger Catalyst

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

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The Russian Rocket Reaction
Episode 5
Air Date: Oct 13, 2011

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.

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The Rhinitis Revelation
Episode 6
Air Date: Oct 20, 2011

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 cateri…

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The Good Guy Fluctuation
Episode 7
Air Date: Oct 27, 2011

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.

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The Isolation Permutation
Episode 8
Air Date: Nov 3, 2011

The Isolation Permutation

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

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The Ornithophobia Diffusion
Episode 9
Air Date: Nov 10, 2011

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. Meanw…

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The Flaming Spittoon Acquisition
Episode 10
Air Date: Nov 17, 2011

The Flaming Spittoon Acquisition

Sheldon considers taking his relationship with Amy to the next level when Stuart from the comic book store asks her out on a date.

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The Speckerman Recurrence
Episode 11
Air Date: Dec 8, 2011

The Speckerman Recurrence

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

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The Shiny Trinket Maneuver
Episode 12
Air Date: Jan 12, 2012

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 disli…

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The Recombination Hypothesis
Episode 13
Air Date: Jan 19, 2012

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 relation…

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The Beta Test Initiation
Episode 14
Air Date: Jan 26, 2012

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…

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The Friendship Contraction
Episode 15
Air Date: Feb 2, 2012

The Friendship Contraction

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

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The Vacation Solution
Episode 16
Air Date: Feb 9, 2012

The Vacation Solution

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

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The Rothman Disintegration
Episode 17
Air Date: Feb 16, 2012

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, s…

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The Werewolf Transformation
Episode 18
Air Date: Feb 23, 2012

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…

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The Weekend Vortex
Episode 19
Air Date: Mar 8, 2012

The Weekend Vortex

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

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The Transporter Malfunction
Episode 20
Air Date: Mar 29, 2012

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 h…

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The Hawking Excitation
Episode 21
Air Date: Apr 5, 2012

The Hawking Excitation

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

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The Stag Convergence
Episode 22
Air Date: Apr 26, 2012

The Stag Convergence

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

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The Launch Acceleration
Episode 23
Air Date: May 3, 2012

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, Leo…

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The Countdown Reflection
Episode 24
Air Date: May 10, 2012

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 …

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