Season 5

S05E01 – The Skank Reflex Analysis

Penny is worried with how damaged her friendship with the guys will be ...
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S05E02 – The Infestation Hypothesis

A fight between Sheldon and Penny leaves Amy caught in the middle, while ...
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S05E03 – The Pulled Groin Extrapolation

Leonard and Amy get to know each other better, while Howard and Bernadette ...
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S05E04 – The Wiggly Finger Catalyst

Penny plays Matchmaker for Raj, which results in him finding a girl he ...
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S05E05 – The Russian Rocket Reaction

Sheldon and Leonard get invited to a party at Wil Wheaton's house, and ...
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S05E06 – The Rhinitis Revelation

Sheldon's mother, Mary Cooper, comes to visit, but Sheldon is annoyed that she ...
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S05E07 – The Good Guy Fluctuation

A cute comic book artist puts Leonard and Priya’s relationship to the test, ...
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S05E08 – The Isolation Permutation

Amy becomes heartbroken when she discovers that Penny and Bernadette went wedding dress ...
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S05E09 – The Ornithophobia Diffusion

Leonard and Penny try hanging out as friends on a 'non-date', but end ...
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S05E10 – The Flaming Spittoon Acquisition

When Stuart asks Amy out on a date, Sheldon must confront his feelings ...
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S05E11 – The Speckerman Recurrence

Leonard must face his fears after being contacted by his high school tormentor ...
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S05E12 – The Shiny Trinket Maneuver

Sheldon gets in trouble with Amy when he isn't impressed by her recent ...
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S05E13 – The Recombination Hypothesis

Leonard, who broke up with Priya, asks Penny out to a spur-of the-moment ...
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S05E14 – The Beta Test Initiation

Leonard and Penny deal with the idea of starting a relationship again and ...
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S05E15 – The Friendship Contraction

Sheldon's selfish demands force Leonard to reconsider their friendship. Meanwhile, Wolowitz tries to ...
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S05E16 – The Vacation Solution

When Sheldon is forced to take his vacation, he goes to work with ...
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S05E17 – The Rothman Disintegration

Penny is horrified when Amy gives her a gift: a huge, quite horrible ...
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S05E18 – The Werewolf Transformation

Sheldon becomes agitated when his regular barber is out sick. Astronaut training causes ...
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S05E19 – The Weekend Vortex

Sheldon must choose between joining Amy at her aunt's birthday party or playing ...
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S05E20 – The Transporter Malfunction

Penny buys Leonard and Sheldon “Star Trek” collectibles as a thank-you, leading Sheldon ...
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S05E21 – The Hawking Excitation

When Wolowitz gets to work with Stephen Hawking, Sheldon is willing to do ...
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S05E22 – The Stag Convergence

After the guys throw Howard a bachelor party, Bernadette reconsiders marrying him after ...
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S05E23 – The Launch Acceleration

When NASA moves up Howard's mission, he must face his fears and Bernadette's ...
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S05E24 – The Countdown Reflection

The fifth season ends with Howard and Bernadette deciding to get married before ...
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