Last episode
The Stockholm Syndrome
s12e24 · 2019-05-17 · 00:30
What it is
The Big Bang Theory is a comedy about brilliant physicists, Leonard and Sheldon, who are the kind of "beautiful minds" that understand how the universe works. But none of that genius helps them interact with people, especially women. All this begins to change when a free-spirited beauty named Penny moves in next door. Sheldon, Leonard's roommate, is quite content spending his nights playing Klingon Boggle with their socially dysfunctional friends, fellow Cal Tech scientists Wolowitz and Koothrappali. However, Leonard sees in Penny a whole new universe of possibilities... including love.
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Episode guide
23 this season · 279 totals03e01 The Electric Can Opener Fluctuation 2009-09-22 01:30
The Electric Can Opener Fluctuation
Sheldon flees back to Texas in disgrace when he learns the guys tampered with his arctic expedition data, forcing the guys to follow him and threatening Leonard's hopes for a romantic encounter with Penny.
s03e02 The Jiminy Conjecture 2009-09-29 01:30
The Jiminy Conjecture
Leonard and Penny struggle to recover from an awkward first hookup while Sheldon and Howard stake their best comic books on a bet to determine the species of a cricket.
s03e03 The Gothowitz Deviation 2009-10-06 01:30
The Gothowitz Deviation
Howard and Raj visit a Goth nightclub to pick up women while Sheldon attempts to build a better Penny using chocolate-based behavior modification.
s03e04 The Pirate Solution 2009-10-13 01:30
The Pirate Solution
Raj must find a new job or be sent back to India, but Sheldon has a solution, which leaves Leonard and Penny dealing with Howard as third wheel.
s03e05 The Creepy Candy Coating Corollary 2009-10-20 01:30
The Creepy Candy Coating Corollary
While Sheldon settles a score with his nemesis, Wil Wheaton, Wolowitz begs Leonard to get Penny to set him up with one of her friends.
s03e06 The Cornhusker Vortex 2009-11-03 02:30
The Cornhusker Vortex
Sheldon teaches Leonard how to understand football while a kite-fighting incident threatens Howard and Raj's friendship.
s03e07 The Guitarist Amplification 2009-11-10 02:30
The Guitarist Amplification
An argument between Leonard and Penny proves "inconvenient" to Sheldon.
s03e08 The Adhesive Duck Deficiency 2009-11-17 02:30
The Adhesive Duck Deficiency
With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely on.
s03e09 The Vengeance Formulation 2009-11-24 02:30
The Vengeance Formulation
After he's humiliated on National Public Radio, Sheldon vows to destroy Kripke, while Wolowitz tries not to destroy his new relationship with Bernadette.
s03e10 The Gorilla Experiment 2009-12-08 02:30
The Gorilla Experiment
Sheldon attempts to help Penny understand Leonard's work, and Wolowitz becomes jealous when Leonard starts hanging out with his new girlfriend.
s03e11 The Maternal Congruence 2009-12-15 02:30
The Maternal Congruence
Visit from Leonard's mother delights Sheldon and horrifies Leonard.
s03e12 The Psychic Vortex 2010-01-12 02:30
The Psychic Vortex
While Sheldon and Koothrappali attend a university mixer, Leonard is upset to discover that Penny believes in psychics.
s03e13 The Bozeman Reaction 2010-01-19 02:30
The Bozeman Reaction
When their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.
s03e14 The Einstein Approximation 2010-02-02 02:30
The Einstein Approximation
Sheldon's search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.
s03e15 The Large Hadron Collision 2010-02-09 02:30
The Large Hadron Collision
Leonard can only bring one guest on a trip to see CERN's Large Hadron Collider in Switzerland on Valentine's Day.
s03e16 The Excelsior Acquisition 2010-03-02 02:30
The Excelsior Acquisition
Sheldon winds up in traffic court when he gets a ticket because of Penny.
s03e17 The Precious Fragmentation 2010-03-09 02:30
The Precious Fragmentation
When the guys find a ring from "The Lord of the Rings" at a garage sale, it threatens to tear them apart.
s03e18 The Pants Alternative 2010-03-23 01:30
The Pants Alternative
Sheldon's friends come to his aid when his fear of public speaking stands between him and a coveted award.
s03e19 The Wheaton Recurrence 2010-04-13 01:30
The Wheaton Recurrence
Fight between Leonard and Penny threatens their relationship, while Sheldon battles Wil Wheaton in bowling.
s03e20 The Spaghetti Catalyst 2010-05-04 01:00
The Spaghetti Catalyst
When Leonard and Penny aren't speaking, Sheldon goes to extremes to keep them both happy.
s03e21 The Plimpton Stimulation 2010-05-11 01:30
The Plimpton Stimulation
Leonard and Sheldon compete for the attention of a famous female physicist.
s03e22 The Staircase Implementation 2010-05-18 01:30
The Staircase Implementation
Leonard tells Penny about how he met Sheldon for the first time...and what happened to the elevator.
s03e23 The Lunar Excitation 2010-05-25 01:30
The Lunar Excitation
While Penny worries that dating Leonard has ruined her for normal guys, Wolowitz and Koothrappali search for Sheldon's perfect match online.