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The Big Bang TheoryTV Times

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Episode     Online Video

S06, E05  (First Aired: 
The gang heads to Stuart's comic book store to celebrate Halloween; Leonard uses science to seduce Penny.

S02, E19  (First Aired: 
Penny develops a rivalry with a sexy new female neighbor who threatens her position as queen bee of the building.

S02, E20  (First Aired: 
Wolowitz and Leonard decide to check out a local bar on Ladies' Night.

S02, E21  (First Aired: 
Koothrappali and Leonard take Wolowitz to Las Vegas; Sheldon is forced to bunk with Penny when he gets locked out of his apartment.

S02, E22  (First Aired: 
Penny makes a surprising revelation about Leonard while on her date with Stuart; Wolowitz finds a critical design flaw in his NASA project.

S02, E23  (First Aired: 
While Leonard prepares for a three-month science expedition, he and Penny re-evaluate their feelings for each other.

S03, E01  (First Aired: 
After tampering with Sheldon's Arctic-expedition data, the guys follow him back to Texas, which threatens Leonard's chances for romance with Penny.

S03, E02  (First Aired: 
Penny and Leonard try to recover from an awkward hookup; Howard and Sheldon make a high-stakes bet.

S03, E03  (First Aired: 
Howard and Raj hit a Goth nightclub to meet women; Sheldon tries chocolate-based behavior modification on Penny.

S03, E04  (First Aired: 
Raj faces deportation if he does not find a job; Leonard and Penny deal with Howard as a third wheel.

S06, E11  (First Aired: 
During a game, Sheldon revisits Christmas memories; Amy, Penny and Bernadette look for a date for Koothrappali.

S03, E05  (First Aired: 
Sheldon seeks revenge on his nemesis, Wil Wheaton; Wolowitz wants Penny to set him up with one of her friends.

S03, E06  (First Aired: 
Sheldon teaches Leonard how to understand football; a kite-fighting incident threatens Howard and Raj's friendship.

S03, E07  (First Aired: 
Sheldon tries to make peace when Leonard and Penny get into an argument.

S01, E06  (First Aired: 
Leonard, Sheldon, Wolowitz and Koothrappali attend Penny's Halloween party.

S01, E07  (First Aired: 
Penny sleeps on Leonard and Sheldon's couch when Wolowitz seduces her friend and takes over her apartment; in need of a fourth member, the guys ask Penny to join their ``Halo'' team.

S01, E08  (First Aired: 
On a blind date, Koothrappali discovers that he can talk to the opposite sex after a few drinks, but his date takes an interest in Sheldon.

S01, E09  (First Aired: 
Penny tries to mediate when Sheldon and Leonard disagree on whether to present their joint findings at a physics conference.

S01, E10  (First Aired: 
Leonard and Sheldon try to avoid seeing Penny perform after hearing her sing, but the elaborate lie Sheldon tells leads to an unexpected result.

S01, E11  (First Aired: 
Leonard and the boys avoid Sheldon when he gets sick, leaving Penny to nurse him back to health.

S01, E12  (First Aired: 
Sheldon and Leonard look for a way to derail a 15-year-old physics prodigy's research.

S01, E13  (First Aired: 
When Sheldon tries to prove his mental superiority as they train for the Physics Bowl, the guys kick him off the team and bring his nemesis (Sara Gilbert) aboard.

S03, E08  (First Aired: 
Penny is forced to rely on Sheldon when she is injured while Howard, Leonard and Raj are away.

S03, E09  (First Aired: 
After being humiliated on the radio, Sheldon vows to destroy Kripke; Wolowitz tries to not ruin his new relationship with Bernadette.

S03, E10  (First Aired: 
Sheldon tries to help Penny understand Leonard's work; Wolowitz gets jealous when Leonard starts hanging out with his new girlfriend.

S03, E11  (First Aired: 
Leonard is horrified when his mother (Christine Baranski) visits.

S03, E12  (First Aired: 
Sheldon and Koothrappali attend a university mixer; Leonard discovers that Penny believes in psychics.

S03, E13  (First Aired: 
After their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.

S03, E14  (First Aired: 
Sheldon tries to figure out the answer to a physics problem by working with Penny.

S03, E15  (First Aired: 
Leonard must choose who to bring with him when he goes to see the Large Hadron Collider on Valentine's Day.

S03, E16  (First Aired: 
Sheldon ends up in traffic court after getting a ticket because of Penny.

S03, E17  (First Aired: 
When the guys buy a ring from ``The Lord of the Rings'' at a garage sale, the item threatens to tear them apart.

S06, E14  (First Aired: 
Sheldon faces a crisis of confidence when he is forced to work with his nemesis, Barry Kripke; Raj and Howard buy expensive action figures of themselves.

S03, E18  (First Aired: 
Sheldon's stage fright stands between him and a coveted award.

S03, E19  (First Aired: 
Penny and Leonard have a fight that threatens their relationship; Sheldon and Wil Wheaton face off once again.

S03, E20  (First Aired: 
Sheldon goes to extremes to keep Leonard and Penny happy when they stop speaking to each other.

S01, E03  (First Aired: 
Unhappy to learn that Penny is seeing someone, Leonard summons the courage to ask another woman on a date.

S01, E04  (First Aired: 
Getting fired gives Sheldon the opportunity to explore life beyond physics, but when he spends his time weaving ponchos and acting like a shut-in, Leonard calls Sheldon's mother for assistance.

S01, E05  (First Aired: 
Leonard, realizing his pursuit of Penny is fruitless, has an unexpected encounter with a fellow scientist (Sara Gilbert).

S02, E06  (First Aired: 
Sheldon and the gang are confused when a young grad student is attracted to him.

S02, E07  (First Aired: 
When Sheldon bans Penny from the apartment for a series of petty infractions, Penny vows to get revenge.

S02, E08  (First Aired: 
Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.

S01, E14  (First Aired: 
Leonard and the guys buy a time machine prop from a classic movie; Penny tells the guys their obsession with comics and toys is pathetic.

S01, E15  (First Aired: 
Leonard devises a plan to eliminate his rivals when he, Wolowitz and Koothrappali all fall for Sheldon's twin sister, but his plan backfires when Sheldon decides to choose who his sister dates.

S01, E16  (First Aired: 
Penny learns that Leonard does not celebrate birthdays, so she plans a surprise party; Sheldon unexpectedly gets to live out one of his biggest fantasies in an electronics store.

S01, E17  (First Aired: 
When Leonard finally works up the courage to ask Penny out on a date, they each turn to Sheldon for advice.

S02, E01  (First Aired: 
Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.

S02, E02  (First Aired: 
After seeing Penny with a handsome new guy, Leonard rushes into a rebound relationship with Sheldon's nemesis, Leslie Winkle.