The Big Bang Theory · Season 5
24 episodes listed, beginning 2011-09-22.
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- Episode 1
The Skank Reflex Analysis
30 minutes
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Penny worries that she's screwed things up permanently with her friends, while Sheldon takes command of the paintball team.
- Episode 2
The Infestation Hypothesis
30 minutes
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Fight between Sheldon and Penny leaves Amy caught in the middle, while Leonard tries to spice up his long-distance relationship with Priya.
- Episode 3
The Pulled Groin Extrapolation
30 minutes
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Leonard and Amy get to know each other better, while Howard and Bernadette spend the weekend with Mrs. Wolowitz.
- Episode 4
The Wiggly Finger Catalyst
30 minutes
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Raj finally meets a girl he can communicate with.
- Episode 5
The Russian Rocket Reaction
30 minutes
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Sheldon and Leonard get invited to a party at Wil Wheaton's house, and Howard gets an out-of-this-world opportunity.
- Episode 6
The Rhinitis Revelation
30 minutes
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Sheldon competes with the gang for his mother's attention when she comes to visit.
- Episode 7
The Good Guy Fluctuation
30 minutes
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Cute comic book artist puts Leonard and Priya's relationship to the test, while Sheldon tries to scare the guys for Halloween.
- Episode 8
The Isolation Permutation
30 minutes
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Amy is crushed when Bernadette and Penny go shopping for wedding dresses without her.
- Episode 9
The Ornithophobia Diffusion
30 minutes
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Leonard and Penny try hanging out alone, and Sheldon must overcome his fear of birds.
- Episode 10
The Flaming Spittoon Acquisition
30 minutes
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Sheldon considers taking his relationship with Amy to the next level when Stuart from the comic book store asks her out on a date.
- Episode 11
The Speckerman Recurrence
30 minutes
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Leonard must face his fears after being contacted by his high school tormentor.
- Episode 12
The Shiny Trinket Maneuver
30 minutes
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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.
- Episode 13
The Recombination Hypothesis
30 minutes
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Everything might change when Leonard offers Penny a spur of the moment invitation to a romantic dinner for two.
- Episode 14
The Beta Test Initiation
30 minutes
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Leonard and Penny experiment with dating, while Raj develops a peculiar relationship with his phone's virtual assistant.
- Episode 15
The Friendship Contraction
30 minutes
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Sheldon's selfish demands force Leonard to reconsider their friendship. Meanwhile, Wolowitz tries to pick his astronaut nickname.
- Episode 16
The Vacation Solution
30 minutes
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When Sheldon is forced to take his vacation, he goes to work with Amy in her neurobiology lab. Meanwhile, Bernadette wants Howard to sign a pre-nup.
- Episode 17
The Rothman Disintegration
30 minutes
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When an office at the University opens up, Sheldon must compete for it with his archenemy, Kripke. Meanwhile, a gift from Amy makes Penny uncomfortable.
- Episode 18
The Werewolf Transformation
30 minutes
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Sheldon's life is turned upside-down after his barber gets sick. Meanwhile, astronaut training causes Wolowitz to rethink his decision to go into space.
- Episode 19
The Weekend Vortex
30 minutes
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Sheldon chooses to play video games with the guys rather than go with Amy to her aunt's birthday party.
- Episode 20
The Transporter Malfunction
30 minutes
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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.
- Episode 21
The Hawking Excitation
30 minutes
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When Wolowitz gets to work with Stephen Hawking, Sheldon is willing to do anything to meet his hero.
- Episode 22
The Stag Convergence
30 minutes
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Bernadette reconsiders marrying Howard after learning about his sexual history.
- Episode 23
The Launch Acceleration
30 minutes
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NASA reschedules Howard's mission, putting his and Bernadette's wedding plans in jeopardy. Meanwhile, Leonard says something surprising to Penny in the bedroom.
- Episode 24
The Countdown Reflection
30 minutes
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When Howard and Bernadette decide they want to be married before his NASA launch, the gang rushes to put on a wedding.
Original air-order information: TVmaze, CC BY-SA 4.0. Listed through September 10, 2026. Regular episodes only; specials and future air dates are not included.