Penny throws herself at Leonard after he returns from three months at the North Pole and they begin a relationship, Penny and Sheldon start a quirky friendship though she can still annoy him, Howard begins to date Bernadette Rostenkowski and Sheldon meets Amy Farrah Fowler.
S03E01 The Electric Can Opener Fluctuation
Sep 21, 2009Sheldon 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.
30m
S03E02 The Jiminy Conjecture
Sep 28, 2009Leonard 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.
30m
S03E03 The Gothowitz Deviation
Oct 5, 2009Howard and Raj visit a Goth nightclub to pick up women while Sheldon attempts to build a better Penny using chocolate-based behavior modification.
30m
S03E04 The Pirate Solution
Oct 12, 2009Raj 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.
30m
S03E05 The Creepy Candy Coating Corollary
Oct 19, 2009While Sheldon settles a score with his nemesis, Wil Wheaton, Wolowitz begs Leonard to get Penny to set him up with one of her friends.
30m
S03E06 The Cornhusker Vortex
Nov 2, 2009Sheldon teaches Leonard how to understand football while a kite-fighting incident threatens Howard and Raj's friendship.
30m
S03E07 The Guitarist Amplification
Nov 9, 2009An argument between Leonard and Penny proves "inconvenient" to Sheldon.
30m
S03E08 The Adhesive Duck Deficiency
Nov 16, 2009With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely on.
30m
S03E09 The Vengeance Formulation
Nov 23, 2009After he's humiliated on National Public Radio, Sheldon vows to destroy Kripke, while Wolowitz tries not to destroy his new relationship with Bernadette.
30m
S03E10 The Gorilla Experiment
Dec 7, 2009Sheldon attempts to help Penny understand Leonard's work, and Wolowitz becomes jealous when Leonard starts hanging out with his new girlfriend.
30m
S03E11 The Maternal Congruence
Dec 14, 2009Visit from Leonard's mother delights Sheldon and horrifies Leonard.
30m
S03E12 The Psychic Vortex
Jan 11, 2010While Sheldon and Koothrappali attend a university mixer, Leonard is upset to discover that Penny believes in psychics.
30m
S03E13 The Bozeman Reaction
Jan 18, 2010When their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.
30m
S03E14 The Einstein Approximation
Feb 1, 2010Sheldon's search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.
30m
S03E15 The Large Hadron Collision
Feb 8, 2010Leonard can only bring one guest on a trip to see CERN's Large Hadron Collider in Switzerland on Valentine's Day.
30m
S03E16 The Excelsior Acquisition
Mar 1, 2010Sheldon winds up in traffic court when he gets a ticket because of Penny.
30m
S03E17 The Precious Fragmentation
Mar 8, 2010When the guys find a ring from "The Lord of the Rings" at a garage sale, it threatens to tear them apart.
30m
S03E18 The Pants Alternative
Mar 22, 2010Sheldon's friends come to his aid when his fear of public speaking stands between him and a coveted award.
30m
S03E19 The Wheaton Recurrence
Apr 12, 2010Fight between Leonard and Penny threatens their relationship, while Sheldon battles Wil Wheaton in bowling.
30m
S03E20 The Spaghetti Catalyst
May 3, 2010When Leonard and Penny aren't speaking, Sheldon goes to extremes to keep them both happy.
30m
S03E21 The Plimpton Stimulation
May 10, 2010Leonard and Sheldon compete for the attention of a famous female physicist.
30m
S03E22 The Staircase Implementation
May 17, 2010Leonard tells Penny about how he met Sheldon for the first time...and what happened to the elevator.
30m
S03E23 The Lunar Excitation
May 24, 2010While Penny worries that dating Leonard has ruined her for normal guys, Wolowitz and Koothrappali search for Sheldon's perfect match online.
30m
