The Big Bang Theory - Season 5
Season 5
Penny regrets her sleeping with Raj and has become very good friends with Leonard, Leonard breaks up with Priya, Amy pushes Sheldon in their relationship eventually becoming boyfriend and girlfriend, Penny and the other women become a clique of their own, Howard prepares for his wedding and going into space to the International Space Station and Leonard asks Penny out as they begin "Leonard and Penny 2.0".
Episodes
The Skank Reflex Analysis
Penny worries that she's screwed things up permanently with her friends, while Sheldon takes command of the paintball team.
The Infestation Hypothesis
Fight between Sheldon and Penny leaves Amy caught in the middle, while Leonard tries to spice up his long-distance relationship with Priya.
The Pulled Groin Extrapolation
Leonard and Amy get to know each other better, while Howard and Bernadette spend the weekend with Mrs. Wolowitz.
The Wiggly Finger Catalyst
Raj finally meets a girl he can communicate with.
The Russian Rocket Reaction
Sheldon and Leonard get invited to a party at Wil Wheaton's house, and Howard gets an out-of-this-world opportunity.
The Rhinitis Revelation
Sheldon competes with the gang for his mother's attention when she comes to visit.
The Good Guy Fluctuation
Cute comic book artist puts Leonard and Priya's relationship to the test, while Sheldon tries to scare the guys for Halloween.
The Isolation Permutation
Amy is crushed when Bernadette and Penny go shopping for wedding dresses without her.
The Ornithophobia Diffusion
Leonard and Penny try hanging out alone, and Sheldon must overcome his fear of birds.
The Flaming Spittoon Acquisition
Sheldon considers taking his relationship with Amy to the next level when Stuart from the comic book store asks her out on a date.
The Speckerman Recurrence
Leonard must face his fears after being contacted by his high school tormentor.
The Shiny Trinket Maneuver
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.
The Recombination Hypothesis
Everything might change when Leonard offers Penny a spur of the moment invitation to a romantic dinner for two.
The Beta Test Initiation
Leonard and Penny experiment with dating, while Raj develops a peculiar relationship with his phone's virtual assistant.
The Friendship Contraction
Sheldon's selfish demands force Leonard to reconsider their friendship. Meanwhile, Wolowitz tries to pick his astronaut nickname.
The Vacation Solution
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.
The Rothman Disintegration
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.
The Werewolf Transformation
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.
The Weekend Vortex
Sheldon chooses to play video games with the guys rather than go with Amy to her aunt's birthday party.
The Transporter Malfunction
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.
The Hawking Excitation
When Wolowitz gets to work with Stephen Hawking, Sheldon is willing to do anything to meet his hero.
The Stag Convergence
Bernadette reconsiders marrying Howard after learning about his sexual history.
The Launch Acceleration
NASA reschedules Howard's mission, putting his and Bernadette's wedding plans in jeopardy. Meanwhile, Leonard says something surprising to Penny in the bedroom.
The Countdown Reflection
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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