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[S04e13] Watch The Big Bang Theory Season 4 Episode 13 The Love Car Displacement Online Free

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Tension runs high when everyone is staying at the same hotel for a science event and Bernadette runs into her ex-boyfriend.

[S04e12] Watch The Big Bang Theory Season 4 Episode 12 The Bus Pants Utilization Online Free

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Leonard's idea for a smartphone app upsets his friendship with Sheldon.

[S04e11] Watch The Big Bang Theory Season 4 Episode 11 The Justice League Recombination Online Free

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The guys find a "super" use for Penny's new boyfriend, Zack, when they enter a costume contest as the Justice League.

[S04e10] Watch The Big Bang Theory Season 4 Episode 10 The Alien Parasite Hypothesis Online Free

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Amy finds she's sexually attracted to Penny's ex; Koothrappali and Wolowitz try to prove who would be the better superhero.

[S04e09] Watch The Big Bang Theory Season 4 Episode 9 The Boyfriend Complexity Online Free

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Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.

[S04e08] Watch The Big Bang Theory Season 4 Episode 8 The 21-second Excitation Online Free

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While the guys camp in line for a screening, Penny and Bernadette invite Amy to her first slumber party.

[S04e07] Watch The Big Bang Theory Season 4 Episode 7 The Apology Insufficiency Online Free

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The gang is interviewed by the FBI and Sheldon's answers put Wolowitz's security clearance in jeopardy.

[S04e06] Watch The Big Bang Theory Season 4 Episode 6 The Irish Pub Formulation Online Free

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Leonard doesn't tell Sheldon, Howard or Raj about his secret affair.

[S04e05] Watch The Big Bang Theory Season 4 Episode 5 The Desperation Emanation Online Free

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While Leonard is feeling lonely and realizes he's the only one without a girlfriend, Sheldon wants to be single.

[S04e04] Watch The Big Bang Theory Season 4 Episode 4 The Hot Troll Deviation Online Free

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An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.

[S04e03] Watch The Big Bang Theory Season 4 Episode 3 The Zazzy Substitution Online Free

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The guys become worried when Sheldon starts looking for an alternative to human companionship.

[S04e02] Watch The Big Bang Theory Season 4 Episode 2 The Cruciferous Vegetable Amplification Online Free

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Sheldon realizes that by the time he downloads his consciousness into a robot body, he'll be dead, so he tries to make himself live longer.