Seasons & episodes
S3 · E6The Cornhusker Vortex 7.9 / 10 · 1 published rating 2009-11-02 · 20 min
Sheldon becomes Leonard's teacher in order to understand football, while an incident with flying a kite threatens Howard and Raj's friendship.
S3 · E7The Guitarist Amplification 8.7 / 10 · 1 published rating 2009-11-09 · 19 min
A squabble between Leonard and Penny sees Sheldon playing mediator, though out of his own incovenience from the sitiation rather than altruism.
S3 · E8The Adhesive Duck Deficiency 8.5 / 10 · 1 published rating 2009-11-16 · 21 min
With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely on.
S3 · E9The Vengeance Formulation 8.3 / 10 · 1 published rating 2009-11-23 · 19 min
After he's humiliated on National Public Radio, Sheldon vows to destroy Kripke, while Wolowitz tries not to destroy his new relationship with Bernadette.
S3 · E10The Gorilla Experiment 7.9 / 10 · 1 published rating 2009-12-07 · 21 min
Penny 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.
S3 · E11The Maternal Congruence 8.9 / 10 · 1 published rating 2009-12-14 · 20 min
A 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.
S3 · E12The Psychic Vortex 7.8 / 10 · 1 published rating 2010-01-11 · 19 min
Leonard 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.
S3 · E13The Bozeman Reaction 8.8 / 10 · 1 published rating 2010-01-18 · 20 min
When their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.
S3 · E14The Einstein Approximation 8.0 / 10 · 1 published rating 2010-02-01 · 19 min
Sheldon's search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.
S3 · E15The Large Hadron Collision 7.9 / 10 · 1 published rating 2010-02-08 · 21 min
Leonard 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.
S3 · E16The Excelsior Acquisition 8.6 / 10 · 1 published rating 2010-03-01 · 21 min
Sheldon winds up in traffic court when he gets a ticket because of Penny.
S3 · E17The Precious Fragmentation 8.8 / 10 · 1 published rating 2010-03-08 · 20 min
When the guys find a ring from "The Lord of the Rings" at a garage sale, it threatens to tear them apart.
S3 · E18The Pants Alternative 8.5 / 10 · 1 published rating 2010-03-22 · 21 min
Sheldon's friends come to his aid when his fear of public speaking stands between him and a coveted award.
S3 · E19The Wheaton Recurrence 9.0 / 10 · 1 published rating 2010-04-12 · 21 min
A fight between Leonard and Penny threatens their relationship, while Sheldon battles Wil Wheaton in bowling.
S3 · E20The Spaghetti Catalyst 8.1 / 10 · 1 published rating 2010-05-03 · 20 min
When Leonard and Penny aren't speaking, Sheldon goes to extremes to keep them both happy.
S3 · E21The Plimpton Stimulation 8.9 / 10 · 1 published rating 2010-05-10 · 21 min
Leonard and Sheldon compete for the attention of a famous female physicist.
S3 · E22The Staircase Implementation 8.2 / 10 · 1 published rating 2010-05-17 · 20 min
Leonard tells Penny about how he met Sheldon for the first time...and what happened to the elevator.
S3 · E23The Lunar Excitation 8.1 / 10 · 1 published rating 2010-05-24 · 20 min
While Penny worries that dating Leonard has ruined her for normal guys, Wolowitz and Koothrappali search for Sheldon's perfect match online.
S4 · E1The Robotic Manipulation 8.9 / 10 · 1 published rating 2010-09-23 · 21 min
Penny tags along on Sheldon's first ever date; Wolowitz finds a new use for a robotic arm.
S4 · E2The Cruciferous Vegetable Amplification 8.7 / 10 · 1 published rating 2010-09-30 · 21 min
Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.
S4 · E3The Zazzy Substitution 7.8 / 10 · 1 published rating 2010-10-07 · 21 min
The guys are concerned as Sheldon searches for an alternative to human companionship.
S4 · E4The Hot Troll Deviation 8.0 / 10 · 1 published rating 2010-10-14 · 20 min
An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.
S4 · E5The Desperation Emanation 7.9 / 10 · 1 published rating 2010-10-21 · 21 min
Leonard realizes he’s the only one without a girlfriend, while Sheldon wants to get rid of his.
S4 · E6The Irish Pub Formulation 8.3 / 10 · 1 published rating 2010-10-28 · 22 min
Leonard keeps an affair a secret from Sheldon, Howard and Raj.