The Big Bang Theory

E01

Episode 1

★ 7.6

The Skank Reflex Analysis

2011-09-22 · 21m

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.

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E02

Episode 2

★ 7.7

The Infestation Hypothesis

2011-09-22 · 20m

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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E03

Episode 3

★ 7.3

The Pulled Groin Extrapolation

2011-09-29 · 20m

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

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E04

Episode 4

★ 7.4

The Wiggly Finger Catalyst

2011-10-06 · 20m

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

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E05

Episode 5

★ 7.7

The Russian Rocket Reaction

2011-10-13 · 21m

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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E06

Episode 6

★ 7.4

The Rhinitis Revelation

2011-10-20 · 21m

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.

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E07

Episode 7

★ 7.6

The Good Guy Fluctuation

2011-10-27 · 20m

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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E08

Episode 8

★ 7.3

The Isolation Permutation

2011-11-03 · 21m

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

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E09

Episode 9

★ 7.4

The Ornithophobia Diffusion

2011-11-10 · 21m

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.

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E10

Episode 10

★ 7.2

The Flaming Spittoon Acquisition

2011-11-17 · 21m

When 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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E11

Episode 11

★ 7.2

The Speckerman Recurrence

2011-12-08 · 20m

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

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E12

Episode 12

★ 7.1

The Shiny Trinket Maneuver

2012-01-12 · 21m

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.

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E13

Episode 13

★ 7.6

The Recombination Hypothesis

2012-01-19 · 21m

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.

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E14

Episode 14

★ 7.7

The Beta Test Initiation

2012-01-26 · 20m

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.

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E15

Episode 15

★ 7.2

The Friendship Contraction

2012-02-02 · 20m

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

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E16

Episode 16

★ 7.0

The Vacation Solution

2012-02-09 · 21m

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

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E17

Episode 17

★ 7.5

The Rothman Disintegration

2012-02-16 · 21m

Sheldon battles Kripke for a coveted office at the university. Penny receives a very unusual gift from Amy.

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E18

Episode 18

★ 7.8

The Werewolf Transformation

2012-02-23 · 21m

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.

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E19

Episode 19

★ 7.3

The Weekend Vortex

2012-03-08 · 20m

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

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E20

Episode 20

★ 7.2

The Transporter Malfunction

2012-03-29 · 21m

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.

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E21

Episode 21

★ 7.8

The Hawking Excitation

2012-04-05 · 19m

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

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E22

Episode 22

★ 7.2

The Stag Convergence

2012-04-26 · 21m

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

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E23

Episode 23

★ 7.6

The Launch Acceleration

2012-05-03 · 21m

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.

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E24

Episode 24

★ 7.9

The Countdown Reflection

2012-05-10 · 20m

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.

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