The Big Bang Theory: Season 3

After returning from the North Pole, a conflict among the guys sends Sheldon back to Texas and interferes with Leonard's reunion with Penny.

Leonard and Penny's first night together goes awkwardly. Sheldon and Howard wager on the species of a cricket.

Sheldon attempts to covertly alter Penny's habits, while Howard and Raj try their luck meeting women at a Goth-style club.

When Raj has to find a new job or be sent back to India, Sheldon's solution leaves Leonard and Penny dealing with Howard as the third wheel.

Leonard is forced to ask Penny to set Howard up with one of her friends, while Sheldon seeks payback against sci-fi star Wil Wheaton.

Leonard tries to learn about football to fit in with Penny's friends. Meanwhile, a loss in a kite war threatens to end Raj and Howard's friendship.

Sheldon is caught in the middle when Leonard and Penny argue about Penny's friend staying at her apartment.

Penny is forced to turn to Sheldon for help when she dislocates her shoulder in the bathtub. Meanwhile, the rest of the guys accidentally get stoned in the desert while waiting for a meteor shower.

Sheldon plans revenge after Kripke humiliates him on the radio. Howard develops doubts about his relationship with Bernadette.

Sheldon attempts to help Penny understand physics to impress Leonard, while Howard becomes jealous when Bernadette takes an interest in Leonard's research.

Leonard's mother makes a visit to his dismay and Sheldon's delight.

Raj talks Sheldon into being his wingman at a university mixer. Leonard has trouble dealing with Penny consulting a psychic.

When their apartment is robbed, Leonard and Sheldon turn to Howard and Raj to create a state-of-the-art security system.

Sheldon wreaks havoc when he is stumped by a difficult physics question.

When Leonard is offered a trip to Switzerland on Valentine's Day to visit the CERN laboratory, Sheldon uses any and all means to be his guest instead of Penny.

Sheldon misses an opportunity to get Stan Lee's autograph because he has to make an appearance in traffic court.

The guys' friendship is threatened when they find a ring from the "Lord of the Rings" trilogy.

Sheldon seeks help from the rest of the gang in overcoming his fear of public speaking when he receives an award.

Sheldon takes on Wil Wheaton in a game of bowling. Leonard and Penny's relationship comes to a crossroad.

Sheldon is forced to go behind Leonard's back to spend time with Penny following their breakup.

Chaos ensues when a nymphomaniac physicist visiting Sheldon hooks up with Leonard.

Leonard tells Penny about how he and Sheldon became roommates and what happened to the elevator.

Penny has a night of angry, drunken sex with Leonard, much to his confusion. Meanwhile, Howard and Raj search for Sheldon's perfect match online.