Season 3
23 episodes · Sep 21, 2009
Worlds collide in Season 3! A love affair with Penny has opened a big, wide, wonderful world of romance for Leonard. But Sheldon likes the world just the way it was, thank you. All of which makes for a zany comic triangle with brainy, clueless Sheldon and practical, grounded Penny hilariously vying for the role of hypotenuse.
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S3E1The Electric Can Opener Fluctuation
Sep 21, 200922mWhen Sheldon learns the guys tampered with his expedition data he got from the arctic, he leaves to Texas in disgrace. This results in the guys following him, which threatens Leonard's hope for some romantic time with Penny and the guys' friendship with Sheldon.
S3E2The Jiminy Conjecture
Sep 28, 200921mLeonard 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.
S3E3The Gothowitz Deviation
Oct 5, 200920mHoward and Raj visit a Goth nightclub to pick up women while Sheldon attempts to build a better Penny using chocolate-based behavior modification.
S3E4The Pirate Solution
Oct 12, 200921mRaj 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 a third wheel.
S3E5The Creepy Candy Coating Corollary
Oct 19, 200921mAfter overhearing that Wil Wheaton is entering a trading-card competition, Sheldon decides to enter it himself. Meanwhile, Penny sets up one of her friends on a date with Wolowitz.
S3E6The Cornhusker Vortex
Nov 2, 200920mSheldon becomes Leonard's teacher in order to understand football, while an incident with flying a kite threatens Howard and Raj's friendship.
S3E7The Guitarist Amplification
Nov 9, 200919mA squabble between Leonard and Penny sees Sheldon playing mediator, though out of his own incovenience from the sitiation rather than altruism.
S3E8The Adhesive Duck Deficiency
Nov 16, 200921mWith Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely on.
S3E9The Vengeance Formulation
Nov 23, 200919mAfter he's humiliated on National Public Radio, Sheldon vows to destroy Kripke, while Wolowitz tries not to destroy his new relationship with Bernadette.
S3E10The Gorilla Experiment
Dec 7, 200921mPenny gets help from Sheldon in order to understand what Leonard's work is, while Wolowitz develops a jealousy when Leonard starts hanging out with his new girlfriend.
S3E11The Maternal Congruence
Dec 14, 200920mA Christmas visit from his mother has Leonard discovering she's kept a lot of news from him that she shares with Sheldon and worrying if she'll approve of his romance with Penny.
S3E12The Psychic Vortex
Jan 11, 201019mLeonard is aghast to find out a secret of Penny's: she believes in psychics. Meanwhile, Sheldon tries to assist Koothrappali in picking up a girl at a university mixer.
S3E13The Bozeman Reaction
Jan 18, 201020mWhen their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.
S3E14The Einstein Approximation
Feb 1, 201019mSheldon's search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.
S3E15The Large Hadron Collision
Feb 8, 201021mLeonard can only bring one guest on a trip to see CERN's Large Hadron Collider (the world's largest and highest energy particle accelerator) in Switzerland on Valentine's Day.
S3E16The Excelsior Acquisition
Mar 1, 201021mSheldon winds up in traffic court when he gets a ticket because of Penny.
S3E17The Precious Fragmentation
Mar 8, 201020mWhen the guys find a ring from "The Lord of the Rings" at a garage sale, it threatens to tear them apart.
S3E18The Pants Alternative
Mar 22, 201021mSheldon's friends come to his aid when his fear of public speaking stands between him and a coveted award.
S3E19The Wheaton Recurrence
Apr 12, 201021mA fight between Leonard and Penny threatens their relationship, while Sheldon battles Wil Wheaton in bowling.
S3E20The Spaghetti Catalyst
May 3, 201020mWhen Leonard and Penny aren't speaking, Sheldon goes to extremes to keep them both happy.
S3E21The Plimpton Stimulation
May 10, 201021mLeonard and Sheldon compete for the attention of a famous female physicist.
S3E22The Staircase Implementation
May 17, 201020mLeonard tells Penny about how he met Sheldon for the first time...and what happened to the elevator.
S3E23The Lunar Excitation
May 24, 201020mWhile Penny worries that dating Leonard has ruined her for normal guys, Wolowitz and Koothrappali search for Sheldon's perfect match online.