The Big Bang Theory Season 4 Episode 6 The Irish Pub Formulation

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The Big Bang Theory Season 4 Episode 5 The Desperation Emanation

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The Big Bang Theory Season 4 Episode 4 The Hot Troll Deviation

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The Big Bang Theory Season 4 Episode 3 The Zazzy Substitution

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Watch The Big Bang Theory Season 4 Episode 2  The Cruciferous Vegetable Amplification

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The Big Bang Theory Season 3 Episode 23 The Lunar Excitation

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Penny tags along on Sheldon's first date; Wolowitz finds a new use for a robotic arm.

The Big Bang Theory Season 3 Episode 23 ”The Lunar Excitation”

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While Penny worries that dating Leonard has ruined her for normal guys, Wolowitz and Koothrappali search for Sheldon's perfect match online.

The Big Bang Theory Season 3 Episode 22 The Staircase Implementation

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

The Big Bang Theory Season 3 Episode 21 ”The Plimpton Stimulation”

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

The Big Bang Theory Season 3 Episode 20 ”The Spaghetti Catalyst”

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

The Big Bang Theory Season 3 Episode 19  “The Wheaton Recurrence”

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A fight between Leonard and Penny threatens their relationship, while Sheldon battles Wil Wheaton in bowling.

The Big Bang Theory Season 3 Episode 18 The Pants Alternative

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Sheldon's fear of speaking in public threatens his ability to accept an award.

The Big Bang Theory Season 3 Episode 17 The Precious Fragmentation

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The discovery of a prop ring from The Lord of the Rings movies puts a strain on the guys' friendship.

The Big Bang Theory Season 3  Episode 16  The Excelsior Acquisition

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

The Big Bang Theory Season 3 Episode 15 The Large Hadron Collision

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Leonard faces a dilemma in choosing between Sheldon or Penny to accompany him to Switzerland to see CERN's Large Hadron Collider on Valentine's ...

The Big Bang Theory Season 3 Episode 15 The Large Hadron Collision

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Leonard faces a dilemma in choosing between Sheldon or Penny to accompany him to Switzerland to see CERN's Large Hadron Collider on Valentine's ...

The Big Bang Theory Season 3 Episode 14 The Einstein Approximation

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Sheldon ends up working with Penny at The Cheesecake Factory to help solve a physics problem.

The Big Bang Theory Season 3 Episode 13 The Bozeman Reaction

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A robbery of their apartment sees Leonard and Sheldon call on their friends to devise a security system.

The Big Bang Theory Season 3 Episode 12 The Psychic Vortex

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While Sheldon and Koothrappali attend a university mixer, Leonard is upset to discover that Penny believes in psychics.

The Big Bang Theory Season 3 Episode 11 The Maternal Congruence

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

The Big Bang Theory Season 3 Episode 10 The Gorilla Experiment

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The Big Bang Theory Season 3 Episode 9 The Vengeance Formulation

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Sheldon vows payback after Kripke humiliates him on the radio. Howard gets advice concerning his relationship with Bernadette...from "Battlestar Galactica's" Katee Sackhoff.

The Big Bang Theory Season 3 Episode 8 The Adhesive Duck Deficiency

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Penny separates her shoulder in the bathtub, and is forced to turn to Sheldon for help. Meanwhile, the rest of the guys accidentally get stoned ...

The Big Bang Theory Season 3 Episode 7 The Guitarist Amplification

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Sheldon is forced to play peacemaker when Leonard and Penny have an argument, mainly because their fighting is bringing back repressed childhood memories.

The Big Bang Theory Season 3 Episode 6 The Cornhusker Vortex

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To blend in better with several of Penny's friends from back home, Leonard learns about football...from Sheldon. Meanwhile, a loss in a kite war threatens ...

The Big Bang Theory Season 3 Episode 5 The Creepy Candy Coating Corollary

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Wolowitz begs Penny to set him up with one of her friends; Sheldon seeks payback against Wil Wheaton at a trading-card show.

The Big Bang Theory Season 3 Episode 4 The Pirate Solution

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 Raj must find a new job or be sent back to India, but Sheldon has a solution, which leaves Leonard and Penny dealing with Howard ...