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 The Big Bang Theory


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Episode     Online Video

The Wildebeest Implementation

S04, E22  (First Aired: May. 5, 2011)
Raj tries to cure his social anxiety; Penny spies on Leonard and his girlfriend through Bernadette.

The Engagement Reaction

S04, E23  (First Aired: May. 12, 2011)
Howard's mom winds up in the hospital after hearing news of her son's engagement to Bernadette.

The Roommate Transmogrification

S04, E24  (First Aired: May. 19, 2011)
Bernadette gets her Ph.D., inspiring the guys to tease Wolowitz about his lack of a doctorate; Raj becomes Sheldon's roommate.

Pilot

S01, E01  (First Aired: Sep. 24, 2007)
Leonard is happy to meet new neighbor Penny, but his roommate thinks he is chasing an impossible dream.

The Big Bran Hypothesis

S01, E02  (First Aired: Oct. 1, 2007)
Leonard volunteers to sign for a package, hoping to make a good impression on Penny.

The Fuzzy Boots Corollary

S01, E03  (First Aired: Oct. 8, 2007)
Unhappy to learn that Penny is seeing someone, Leonard summons the courage to ask another woman on a date.

The Luminous Fish Effect

S01, E04  (First Aired: Oct. 15, 2007)
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.

The Hamburger Postulate

S01, E05  (First Aired: Oct. 22, 2007)
Leonard, realizing his pursuit of Penny is fruitless, has an unexpected encounter with a fellow scientist (Sara Gilbert).

The Middle Earth Paradigm

S01, E06  (First Aired: Oct. 29, 2007)
Leonard, Sheldon, Wolowitz and Koothrappali attend Penny's Halloween party.

The Speckerman Recurrence

S05, E11  (First Aired: Dec. 8, 2011)
Leonard must face the bully who targeted him in high school.

The Dumpling Paradox

S01, E07  (First Aired: Nov. 5, 2007)
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.

The Grasshopper Experiment

S01, E08  (First Aired: Nov. 12, 2007)
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.

The Cooper-Hofstadter Polarization

S01, E09  (First Aired: Mar. 17, 2008)
Penny tries to mediate when Sheldon and Leonard disagree on whether to present their joint findings at a physics conference.

The Wheaton Recurrence

S03, E19  (First Aired: Apr. 12, 2010)
Penny and Leonard have a fight that threatens their relationship; Sheldon and Wil Wheaton face off once again.

The Staircase Implementation

S03, E22  (First Aired: May. 17, 2010)
Leonard tells Penny about how he met Sheldon and what happened to the elevator.

The Loobenfeld Decay

S01, E10  (First Aired: Mar. 24, 2008)
Leonard and Sheldon try to avoid seeing Penny perform after hearing her sing, but the elaborate lie Sheldon tells leads to an unexpected result.

The Pancake Batter Anomaly

S01, E11  (First Aired: Mar. 31, 2008)
Leonard and the boys avoid Sheldon when he gets sick, leaving Penny to nurse him back to health.

The Jerusalem Duality

S01, E12  (First Aired: Apr. 14, 2008)
Sheldon and Leonard look for a way to derail a 15-year-old physics prodigy's research.

The Bat Jar Conjecture

S01, E13  (First Aired: Apr. 21, 2008)
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.

The Nerdvana Annihilation

S01, E14  (First Aired: Apr. 28, 2008)
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.

The Pork Chop Indeterminacy

S01, E15  (First Aired: May. 5, 2008)
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.

The Peanut Reaction

S01, E16  (First Aired: May. 12, 2008)
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.

The Tangerine Factor

S01, E17  (First Aired: May. 19, 2008)
When Leonard finally works up the courage to ask Penny out on a date, they each turn to Sheldon for advice.

The Bad Fish Paradigm

S02, E01  (First Aired: Sep. 22, 2008)
Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.

The Recombination Hypothesis

S05, E13  (First Aired: Jan. 19, 2012)
Everything could change when Leonard spontaneously invites Penny to a romantic dinner.

The Codpiece Topology

S02, E02  (First Aired: Sep. 29, 2008)
After seeing Penny with a handsome new guy, Leonard rushes into a rebound relationship with Sheldon's nemesis, Leslie Winkle.

The Barbarian Sublimation

S02, E03  (First Aired: Oct. 6, 2008)
Sheldon creates a monster when he introduces Penny to online gaming.

The Griffin Equivalency

S02, E04  (First Aired: Oct. 13, 2008)
Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.

The Plimpton Stimulation

S03, E21  (First Aired: May. 10, 2010)
Leonard and Sheldon compete for a physicist's attention.