The Big Bang Theory: The Complete Series
Episodes
Season 1, Episode 1: Pilot
Meet two brainiacs with a lot to learn. Leonard and Sheldon can tell their quarks from their quantum
Season 1, Episode 2: The Big Bran Hypothesis
After Leonard tries to do a favor for Penny, Sheldon ruins the plan. Leonard volunteers to sign for
Season 1, Episode 3: The Fuzzyboots Corollary
When Leonard sees Penny kissing a guy in front of her apartment door he is devastated. The guys
Season 1, Episode 4: The Luminous Fish Effect
After being fired from his job, Sheldon attempts to explore the "dreadful" life beyond physics. But
Season 1, Episode 5: The Hamburger Postulate
After sensing that his pursuit of Penny isn't going anywhere, Leonard agrees to an unexpected sexual
Season 1, Episode 6: The Middle Earth Paradigm
The socially stunted guys are nervous when Penny invites them to a party she's hosting
Season 1, Episode 7: The Dumpling Paradox
When Wolowitz seduces Penny's friend and ends up sleeping with her in Penny's apartment, Penny
Season 1, Episode 8: The Grasshopper Experiment
Koothrappali becomes overwhelmed when his parents arrange a blind date for him, but he discovers he
Season 1, Episode 9: The Cooper-Hofstadter Polarization
Sheldon and Leonard are invited to present their joint findings at a physics conference, but Sheldon
Season 1, Episode 10: The Loobenfeld Decay
After hearing Penny sing, Leonard lies to avoid seeing her perform. Sheldon goes one step further
Season 1, Episode 11: The Pancake Batter Anomaly
Sheldon gets sick and Penny has to deal with him
Season 1, Episode 12: The Jerusalem Duality
When Leonard and Sheldon meet a teenage physics prodigy, Sheldon is distraught that the boy genius
Season 1, Episode 13: The Bat Jar Conjecture
The guys kick Sheldon off the team for the Physics Bowl and enlist his nemesis Leslie Winkle (
Season 1, Episode 14: The Nerdvana Annihilation
When the guys buy a time-machine prop from a classic movie, Penny's reaction forces Leonard to take
Season 1, Episode 15: The Shiksa Indeterminacy
Leonard, Wolowitz, and Koothrappali all become smitten with Sheldon's twin sister, Missy (guest star
Season 1, Episode 16: The Peanut Reaction
When Penny learns that Leonard doesn't celebrate birthdays, she attempts to throw him a surprise
Season 1, Episode 17: The Tangerine Factor
When Penny breaks up with her boyfriend, Leonard finally gets up the courage to ask her out on a
Season 2, Episode 1: The Bad Fish Paradigm
In the second season premiere, after her first date with Leonard goes awry, Penny finds an unwilling
Season 2, Episode 2: The Codpiece Topology
Penny and Leonard compete to see who will be the first to move on after their breakup. When Leonard
Season 2, Episode 3: The Barbarian Sublimination
Sheldon creates a monster when he introduces Penny to the world of online gaming. Especially when
Season 2, Episode 4: The Griffin Equivalency
Raj's ego puts all of his friendships in jeopardy when he gets an inflated sense of self. Newly
Season 2, Episode 5: The Euclid Alternative
Leonard and his friends stage an intervention to make Sheldon confront his longstanding fear of
Season 2, Episode 6: The Cooper-Nowitzki Theorem
A young grad student's attraction to Sheldon confuses everyone including Sheldon himself
Season 2, Episode 7: The Panty Pinata Polarization
Sheldon and Penny engage in a battle of wills as Penny vows to get revenge on Sheldon when he bans
Season 2, Episode 8: The Lizard-Spock Expansion
Wolowitz (series regular SIMON HELBERG) thinks he's found the love of his life (guest star SARA RUE
Season 2, Episode 9: The White Asparagus Triangulation
Sheldon can barely contain his joy when Leonard starts dating a woman (Sara Rue) who meets Sheldon's
Season 2, Episode 10: The Vartabedian Conundrum
Leonard just can't say no. When his relationship with new girlfriend, Stephanie starts moving too
Season 2, Episode 11: The Bath Item Gift Hypothesis
Leonard's handsome colleague starts dating Penny. And Leonard's friends are being tormented by
Season 2, Episode 12: The Killer Robot Instability
When Penny's comment about Wolowitz's love life sends him into a depressed stupor, his friends lose
Season 2, Episode 13: The Friendship Algorithm
Socially awkward Sheldon develops a scientific procedure for making friends
Season 2, Episode 14: The Financial Permeability
Sheldon's "simple" solution to Penny's financial problem leads to a confrontation between Leonard
Season 2, Episode 15: The Maternal Capacitance
A disastrous visit from Mrs. Hofstadter (special guest star Christine Baranski) brings Leonard and
Season 2, Episode 16: The Cushion Saturation
A paintball game has surprising consequences for Leonard and his friends when it leads to a fight
Season 2, Episode 17: The Terminator Decoupling
A train trip to San Francisco takes a major detour when Leonard, Sheldon, Wolowitz and Raj discover
Season 2, Episode 18: The Work Song Nanocluster
Penny's home hair products business becomes a complete nightmare when a caffeine-addled Sheldon
Season 2, Episode 19: The Dead Hooker Juxtaposition
There's a new queen bee in the building! Penny develops a rivalry with a sexy female neighbor moves
Season 2, Episode 20: The Hofstadter Isotope
While Stuart (guest star Kevin Sussman), a fellow comic book-loving pal of the guys, romances Penny
Season 2, Episode 21: The Vegas Renormalization
Leonard and Koothrappali take a heartbroken Wolowitz to Las Vegas, leaving Sheldon locked out of his
Season 2, Episode 22: The Classified Materials Turbulence
Things begin to look up for Leonard when Penny makes a surprising revelation on her second date with
Season 2, Episode 23: The Monopolar Expedition
On the second season finale, Leonard and Penny reconsider their feelings for one another. When
Season 3, Episode 1: The Electric Can Opener Fluctuation
On the third season premiere, Sheldon (series star Jim Parsons) flees back to Texas in disgrace when
Season 3, Episode 2: The Jiminy Conjecture
Leonard and Penny struggle to recover from an awkward first hookup, while Sheldon and Howard (series
Season 3, Episode 3: The Gothowitz Deviation
Howard and Raj (series star Kunal Nayyar) visit a Goth nightclub to pick up women, while Sheldon
Season 3, Episode 4: The Pirate Solution
Raj must find a new job or be sent back to India. Sheldon, however, has a solution – which leaves
Season 3, Episode 5: The Creepy Candy Coating Corollary
While Sheldon settles a score with his nemesis, Star Trek: The Next Generation's Wil Wheaton (guest
Season 3, Episode 6: The Cornhusker Vortex
Sheldon teaches Leonard how to understand football, while a kite-fighting incident threatens Howard
Season 3, Episode 7: The Guitarist Amplification
Sheldon plays the peacemaker when an argument between Leonard and Penny proves “inconvenient” to him
Season 3, Episode 8: The Adhesive Duck Deficiency
With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely
Season 3, Episode 9: The Vengeance Formulation
After he's humiliated on National Public Radio, Sheldon vows to destroy Kripke (guest star John Ross
Season 3, Episode 10: The Gorilla Experiment
Sheldon takes on his greatest challenge when he attempts to help Penny understand physics, and
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