The Hawking Excitation
Season 5, Ep. 21
Sheldon is in seventh heaven and prepared to do whatever it takes to meet his science idol Stephen Hawking, who is working on a project with Wolowitz.
Original Air Date: April 5, 2012
The Transporter Malfunction
Season 5, Ep. 20
Raj may have found his soul mate after his parents set him up on a date. Meanwhile, Sheldon thinks he's going out of his mind when he begins hearing the voice of Spock (Leonard Nimoy) after he breaks Leonard's "Star Trek" collectible.
Original Air Date: March 29, 2012
The Weekend Vortex
Season 5, Ep. 19
Sheldon opts to spend a weekend playing video games with the guys instead of attending a birthday party for Amy's aunt.
Original Air Date: March 8, 2012
The Werewolf Transformation
Season 5, Ep. 18
After his barber is hospitalized, Sheldon undergoes a hair-raising change in lifestyle as his carefully planned daily routines are thrown for a loop. Meanwhile, Howard is up in the air about continuing his astronaut training.
Original Air Date: February 23, 2012
The Rothman Disintegration
Season 5, Ep. 17
Sheldon and Kripke square off in a series of sports-related competitions to win a coveted corner office at the university. Meanwhile, Penny feels uncomfortable accepting a gift from Amy.
Original Air Date: February 16, 2012
The Friendship Contraction
Season 5, Ep. 15
Sheldon's selfish demands force Leonard to reconsider their friendship. Meanwhile, Wolowitz tries to pick his astronaut nickname.
Original Air Date: February 2, 2012
The Beta Test Initiation
Season 5, Ep. 14
Leonard and Penny experiment with dating, while Raj develops a peculiar relationship with his phone's virtual assistant.
Original Air Date: January 26, 2012
The Recombination Hypothesis
Season 5, Ep. 13
Everything might change when Leonard offers Penny a spur of the moment invitation to a romantic dinner for two.
Original Air Date: January 19, 2012
The Shiny Trinket Manoeuvre
Season 5, Ep. 12
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.
Original Air Date: January 12, 2012
The Speckerman Recurrence
Season 5, Ep. 11
Leonard must face his fears after being contacted by his high school tormentor.
Original Air Date: December 8, 2011
The Flaming Spittoon Acquisition
Season 5, Ep. 10
Sheldon considers taking his relationship with Amy to the next level when Stuart from the comic book store asks her out on a date.
Original Air Date: November 17, 2011
The Ornithophibia Diffusion
Season 5, Ep. 9
Leonard and Penny try hanging out alone, and Sheldon must overcome his fear of birds.
Original Air Date: November 10, 2011
The Isolation Permutation
Season 5, Ep. 8
Amy is crushed when Bernadette and Penny go shopping for wedding dresses without her.
Original Air Date: November 3, 2011
Good Guy Fluctuation
Season 5, Ep. 7
An attractive comic book artist tests Leonard and Priya's relationship; Sheldon tries to scare his friends.
The Rhinitis Revelation
Season 5, Ep. 6
Sheldon finds himself competing with the gang for his mother's attention when she visits.View Gallery ►
The Wiggly Finger Catalyst
Season 5, Ep. 4
Raj meets a woman with whom he's able to talk.
The Pulled Groin Extrapolation
Season 5, Ep. 3
Amy and Leonard try to become better acquainted; Bernadette, Howard and Mrs. Wolowitz spend the weekend together.
The Skank Reflex Analysis *Premiere*
Season 5, Ep. 1
Penny hits a low point when she realizes what she's done by sleeping with Raj; Sheldon becomes the leader of the paintball team.
The Roommate Transmogrification
Season 4, Ep. 24
Hearing Star Trek sex games between Leonard and Priya sends Raj to live with Sheldon. Bernadette's earning her Ph.D makes the guys mock Wolowitz for not having one even more.View Gallery ►
The Engagement Reaction
Season 4, Ep. 23
Mrs. Wolowitz ends up in the hospital after Howard tells her he's marrying Bernadette. While there, Leonard stresses over Penny and Priya warming up to one another.
The Wildebeest Implementation
Season 4, Ep. 22
Amy recognizes a dinner invitation to be a chance for Bernadette to spy on Leonard and Priya for Penny. Meanwhile, a lonely Raj considers taking experimental medication to cure himself of his inability to talk to women while sober, and Sheldon devises three-person chess.View Gallery ►
The Agreement Dissection
Season 4, Ep. 21
Miffed over Priya breaking down the Roommate Agreement using legal theory, Sheldon joins Penny, Bernadette, and Amy on their girls' night.View Gallery ►
The Herb Garden Germination
Season 4, Ep. 20
Sheldon and Amy decide to start rumors about themselves as a social test. Meanwhile, Howard takes his relationship with Bernadette to an even higher level.
The Zarnecki Incursion
Season 4, Ep. 19
When Sheldon has his World of Warcraft account hacked and his character stolen from, the guys team up to discover out who did it. Meanwhile, Bernadette and Amy try to help Penny deal with Leonard's continuing relationship with Priya.View Gallery ►
The Prestidigitation Approximation
Season 4, Ep. 18
Sheldon is baffled by Wolowitz's magic trick. Meanwhile, Priya disapproves of Leonard continuing to be friends with Penny.View Gallery ►