The Big Bang Theory - Season 2
Season 2
Leonard and Penny's relationship takes a turn for the worse when they break up, but is quickly resolved. Soon their relationship progresses into a stronger friendship than before, while Sheldon and Penny's friendship slowly begins.
Episodes
The Bad Fish Paradigm
After her first date with Leonard goes awry, Penny finds an unwilling confidant in Leonard's anti-social roommate, Sheldon.
The Codpiece Topology
When Leonard sees Penny with a handsome new guy, he enters into a rebound relationship with Sheldon's nemesis, Leslie Winkle.
The Barbarian Sublimation
Sheldon creates a monster when he introduces Penny to the world of online gaming.
The Griffin Equivalency
Raj, newly famous because of an article in a magazine, gets a big head and makes a disastrous play for Leonard's crush, Penny.
The Euclid Alternative
Leonard and his friends stage an intervention to make Sheldon confront his longstanding fear of driving.
The Cooper-Nowitzki Theorem
Young grad student's attraction to Sheldon confuses everyone, including Sheldon himself.
The Panty Piñata Polarization
Penny vows to get revenge on Sheldon when he bans her from the apartment for a series of petty infractions.
The Lizard-Spock Expansion
Wolowitz thinks he's found the love of his life, until she meets Leonard.
The White Asparagus Triangulation
Sheldon can barely contain his joy when Leonard starts dating a woman who meets Sheldon's exacting standards.
The Vartabedian Conundrum
When Leonard's relationship with a new woman starts moving too fast, he goes to Penny for advice.
The Bath Item Gift Hypothesis
Christmas is a source of stress for Leonard - whose handsome colleague starts dating Penny - and his friends, who are being tormented by Sheldon's obsession with gift-giving etiquette.
The Killer Robot Instability
When Penny's comment about Wolowitz's love life sends him into a depressed stupor, his friends lose their most important team-mate in an upcoming fighting robot competition.
The Friendship Algorithm
Socially awkward Sheldon develops a scientific procedure for making friends.
The Financial Permeability
Sheldon's "simple" solution to Penny's financial problem leads to a confrontation between Leonard and Penny's hulking ex-boyfriend, Kurt.
The Maternal Capacitance
Disastrous visit from Mrs. Hofstadter brings Leonard and Penny closer together.
The Cushion Saturation
Paintball game leads to a fight between Penny and Sheldon, and romance for Wolowitz and Leslie.
The Terminator Decoupling
Train trip to San Francisco takes a major detour when Leonard, Sheldon, Wolowitz and Raj discover that beautiful sci-fi actress Summer Glau is onboard.
The Work Song Nanocluster
Penny's home hair products business becomes a complete nightmare when a caffeine-addled Sheldon takes over.
The Dead Hooker Juxtaposition
Penny develops a rivalry with a sexy female neighbor who threatens to become "The New Penny" in the building.
The Hofstadter Isotope
While a fellow comic book-loving pal of the guys romances Penny, Leonard and Wolowitz venture out into the world of "Ladies' Night" at a local bar.
The Vegas Renormalization
Leonard and Koothrappali take a heartbroken Wolowitz to Las Vegas, leaving Sheldon locked out of his apartment and forced to bunk with Penny.
The Classified Materials Turbulence
Things begin to look up for Leonard when Penny makes a surprising revelation on her second date with Stuart. Meanwhile, Wolowitz enlists his friends' help when he discovers a critical design flaw in his project for NASA.
The Monopolar Expedition
Penny is conflicted when Leonard and his friends decide to spend the summer working - at the North Pole.
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