The Big Bang Theory
Season 5
201124 episodes
In season five, Penny and Leonard's relationship is relaunched in full "beta test" mode, while Sheldon, Howard, and Raj discover the feminine mystique is something that cannot be easily graphed or calculated. As Sheldon makes begrudging amendments to his "Relationship Agreement" with his "friend-who-happens-to-be-a-girl" Amy Farrah Fowler, Raj contemplates an arranged marriage, and Howard is all-systems-go for both is NASA space launch and wedding to the spirited Bernadette.
Episode 1
The Skank Reflex Analysis
Sep 22, 201121m
TMDB rating 7.6TMDB
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.
Episode 2
The Infestation Hypothesis
Sep 22, 201120m
TMDB rating 7.7TMDB
A 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
Sep 29, 201120m
TMDB rating 7.3TMDB
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
Oct 6, 201120m
TMDB rating 7.4TMDB
Penny plays Matchmaker for Raj, which results in him finding a girl he is comfortable talking to.
Episode 5
The Russian Rocket Reaction
Oct 13, 201121m
TMDB rating 7.7TMDB
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
Oct 20, 201121m
TMDB rating 7.4TMDB
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.
Episode 7
The Good Guy Fluctuation
Oct 27, 201120m
TMDB rating 7.6TMDB
A 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
Nov 3, 201121m
TMDB rating 7.2TMDB
Amy becomes heartbroken when she discovers that Penny and Bernadette went wedding dress shopping without her.
Episode 9
The Ornithophobia Diffusion
Nov 10, 201121m
TMDB rating 7.4TMDB
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.
Episode 10
The Flaming Spittoon Acquisition
Nov 17, 201121m
TMDB rating 7.2TMDB
When Stuart asks Amy out on a date, Sheldon must confront his feelings and consider where his relationship with Amy is going.
Episode 11
The Speckerman Recurrence
Dec 8, 201120m
TMDB rating 7.2TMDB
Leonard must face his fears after being contacted by his high school tormentor.
Episode 12
The Shiny Trinket Maneuver
Jan 12, 201221m
TMDB rating 7.1TMDB
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
Jan 19, 201221m
TMDB rating 7.6TMDB
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.
Episode 14
The Beta Test Initiation
Jan 26, 201220m
TMDB rating 7.7TMDB
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.
Episode 15
The Friendship Contraction
Feb 2, 201220m
TMDB rating 7.2TMDB
Sheldon's selfish demands force Leonard to reconsider their friendship. Meanwhile, Wolowitz tries to pick his astronaut nickname.
Episode 16
The Vacation Solution
Feb 9, 201221m
TMDB rating 7.1TMDB
When Sheldon is forced to take his vacation, he goes to work with Amy in her neurobiology lab.
Episode 17
The Rothman Disintegration
Feb 16, 201221m
TMDB rating 7.5TMDB
Sheldon battles Kripke for a coveted office at the university. Penny receives a very unusual gift from Amy.
Episode 18
The Werewolf Transformation
Feb 23, 201221m
TMDB rating 7.8TMDB
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.
Episode 19
The Weekend Vortex
Mar 8, 201220m
TMDB rating 7.3TMDB
Sheldon must choose between joining Amy at her aunt's birthday party or playing videogames all weekend with the guys.
Episode 20
The Transporter Malfunction
Mar 29, 201221m
TMDB rating 7.2TMDB
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
Apr 5, 201219m
TMDB rating 7.8TMDB
When Wolowitz gets to work with Stephen Hawking, Sheldon is willing to do anything to meet his hero.
Episode 22
The Stag Convergence
Apr 26, 201221m
TMDB rating 7.2TMDB
After the guys throw Howard a bachelor party, Bernadette reconsiders marrying him after learning about his sexual history.
Episode 23
The Launch Acceleration
May 3, 201221m
TMDB rating 7.6TMDB
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.
Episode 24
The Countdown Reflection
May 10, 201220m
TMDB rating 7.9TMDB
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.