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Leonard and Sheldon are brilliant physicists - geniuses in the laboratory, but socially challenged everywhere else. Enter beautiful, street-smart neighbor, Penny, who aims to teach them a thing or two about life. Despite their on-again, off-again relationship in the past, Leonard believes he's found true love with Penny. Even Sheldon has found a female companion, entering into a "Relationship Agreement" with neurobiologist Amy Farrah Fowler. In their free time, Leonard and Sheldon continue to enjoy frequent trips to the comic book store and fantasy role-playing games with their ever-expanding universe of friends, including fellow scientists Koothrappali, Wolowitz and Wolowitz's adorable microbiologist wife, Bernadette. (source: www.cbs.com)

Genres: Comedy
Station: CBS (US)
Rating: 9.25/10 from 220 users
Status: Ended
Start: 2007-09-24

The Big Bang Theory Season 5 Air Dates

S05E01 - The Skank Reflex Analysis Air Date: 23 September 2011 00:00 -

Penny worries that she's screwed things up permanently with her friends, while Sheldon takes command of the paintball team.

S05E02 - The Infestation Hypothesis Air Date: 23 September 2011 00:30 -

Fight between Sheldon and Penny leaves Amy caught in the middle, while Leonard tries to spice up his long-distance relationship with Priya.

S05E03 - The Pulled Groin Extrapolation Air Date: 30 September 2011 00:00 -

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

S05E04 - The Wiggly Finger Catalyst Air Date: 07 October 2011 00:00 -

Raj finally meets a girl he can communicate with.

S05E05 - The Russian Rocket Reaction Air Date: 14 October 2011 00:00 -

Sheldon and Leonard get invited to a party at Wil Wheaton's house, and Howard gets an out-of-this-world opportunity.

S05E06 - The Rhinitis Revelation Air Date: 21 October 2011 00:00 -

Sheldon competes with the gang for his mother's attention when she comes to visit.

S05E07 - The Good Guy Fluctuation Air Date: 28 October 2011 00:00 -

Cute comic book artist puts Leonard and Priya's relationship to the test, while Sheldon tries to scare the guys for Halloween.

S05E08 - The Isolation Permutation Air Date: 04 November 2011 00:00 -

Amy is crushed when Bernadette and Penny go shopping for wedding dresses without her.

S05E09 - The Ornithophobia Diffusion Air Date: 11 November 2011 01:00 -

Leonard and Penny try hanging out alone, and Sheldon must overcome his fear of birds.

S05E10 - The Flaming Spittoon Acquisition Air Date: 18 November 2011 01:00 -

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

S05E11 - The Speckerman Recurrence Air Date: 09 December 2011 01:00 -

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

S05E12 - The Shiny Trinket Maneuver Air Date: 13 January 2012 01:00 -

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.

S05E13 - The Recombination Hypothesis Air Date: 20 January 2012 01:00 -

Everything might change when Leonard offers Penny a spur of the moment invitation to a romantic dinner for two.

S05E14 - The Beta Test Initiation Air Date: 27 January 2012 01:00 -

Leonard and Penny experiment with dating, while Raj develops a peculiar relationship with his phone's virtual assistant.

S05E15 - The Friendship Contraction Air Date: 03 February 2012 01:00 -

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

S05E16 - The Vacation Solution Air Date: 10 February 2012 01:00 -

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.

S05E17 - The Rothman Disintegration Air Date: 17 February 2012 01:00 -

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.

S05E18 - The Werewolf Transformation Air Date: 24 February 2012 01:00 -

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.

S05E19 - The Weekend Vortex Air Date: 09 March 2012 01:00 -

Sheldon chooses to play video games with the guys rather than go with Amy to her aunt's birthday party.

S05E20 - The Transporter Malfunction Air Date: 30 March 2012 00:00 -

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.

S05E21 - The Hawking Excitation Air Date: 06 April 2012 00:00 -

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

S05E22 - The Stag Convergence Air Date: 27 April 2012 00:00 -

Bernadette reconsiders marrying Howard after learning about his sexual history.

S05E23 - The Launch Acceleration Air Date: 04 May 2012 00:00 -

NASA reschedules Howard's mission, putting his and Bernadette's wedding plans in jeopardy. Meanwhile, Leonard says something surprising to Penny in the bedroom.

S05E24 - The Countdown Reflection Air Date: 11 May 2012 00:00 -

When Howard and Bernadette decide they want to be married before his NASA launch, the gang rushes to put on a wedding.

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