Season 3

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.

Season episodes list 3

S03E01

S03E01 : The Electric Can Opener Fluctuation 8.37/10 (aired on 09/21/2009)

When Sheldon learns the guys tampered with his expedition data he got from the arctic, he leaves to…
S03E02

S03E02 : The Jiminy Conjecture 7.92/10 (aired on 09/28/2009)

Leonard and Penny struggle to recover from an awkward first hookup while Sheldon and Howard stake…
S03E03

S03E03 : The Gothowitz Deviation 8.28/10 (aired on 10/05/2009)

Howard and Raj visit a Goth nightclub to pick up women while Sheldon attempts to build a better…
S03E04

S03E04 : The Pirate Solution 8.11/10 (aired on 10/12/2009)

Raj must find a new job or be sent back to India, but Sheldon has a solution, which leaves Leonard…
S03E05

S03E05 : The Creepy Candy Coating Corollary 8.28/10 (aired on 10/19/2009)

After overhearing that Wil Wheaton is entering a trading-card competition, Sheldon decides to enter…
S03E06

S03E06 : The Cornhusker Vortex 7.65/10 (aired on 11/02/2009)

Sheldon becomes Leonard's teacher in order to understand football, while an incident with flying a…
S03E07

S03E07 : The Guitarist Amplification 7.92/10 (aired on 11/09/2009)

A squabble between Leonard and Penny sees Sheldon playing mediator, though out of his own…
S03E08

S03E08 : The Adhesive Duck Deficiency 8.86/10 (aired on 11/16/2009)

With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely…
S03E09

S03E09 : The Vengeance Formulation 8.38/10 (aired on 11/23/2009)

After he's humiliated on National Public Radio, Sheldon vows to destroy Kripke, while Wolowitz…
S03E10

S03E10 : The Gorilla Experiment 8.47/10 (aired on 12/07/2009)

Penny gets help from Sheldon in order to understand what Leonard's work is, while Wolowitz develops…
S03E11

S03E11 : The Maternal Congruence 8.29/10 (aired on 12/14/2009)

A Christmas visit from his mother has Leonard discovering she's kept a lot of news from him that…
S03E12

S03E12 : The Psychic Vortex 8.38/10 (aired on 01/11/2010)

Leonard is aghast to find out a secret of Penny's: she believes in psychics. Meanwhile, Sheldon…
S03E13

S03E13 : The Bozeman Reaction 8.1/10 (aired on 01/18/2010)

When their apartment is robbed, Leonard and Sheldon turn to their friends to create a…
S03E14

S03E14 : The Einstein Approximation 8.48/10 (aired on 02/01/2010)

Sheldon's search for the answer to a physics problem leads him to work at the Cheesecake Factory…
S03E15

S03E15 : The Large Hadron Collision 8.12/10 (aired on 02/08/2010)

Leonard can only bring one guest on a trip to see CERN's Large Hadron Collider (the world's largest…
S03E16

S03E16 : The Excelsior Acquisition 8.29/10 (aired on 03/01/2010)

Sheldon winds up in traffic court when he gets a ticket because of Penny.
S03E17

S03E17 : The Precious Fragmentation 8.46/10 (aired on 03/08/2010)

When the guys find a ring from "The Lord of the Rings" at a garage sale, it threatens to tear them…
S03E18

S03E18 : The Pants Alternative 8.51/10 (aired on 03/22/2010)

Sheldon's friends come to his aid when his fear of public speaking stands between him and a coveted…
S03E19

S03E19 : The Wheaton Recurrence 8.01/10 (aired on 04/12/2010)

A fight between Leonard and Penny threatens their relationship, while Sheldon battles Wil Wheaton…
S03E20

S03E20 : The Spaghetti Catalyst 8.18/10 (aired on 05/03/2010)

When Leonard and Penny aren't speaking, Sheldon goes to extremes to keep them both happy.
S03E21

S03E21 : The Plimpton Stimulation 8.21/10 (aired on 05/10/2010)

Leonard and Sheldon compete for the attention of a famous female physicist.
S03E22

S03E22 : The Staircase Implementation 8.95/10 (aired on 05/17/2010)

Leonard tells Penny about how he met Sheldon for the first time...and what happened to the elevator.
S03E23

S03E23 : The Lunar Excitation 8.57/10 (aired on 05/24/2010)

While Penny worries that dating Leonard has ruined her for normal guys, Wolowitz and Koothrappali…