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The Big Bang Theory (OAD: )

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The Big Bang Theory : The Alien Parasite Hypothesis


Amy realizes she has feelings for Penny's ex; Koothrappali and Wolowitz try to prove who would be a better superhero.

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Previous Episode

The Boyfriend Complexity

(First Aired: November 18, 2010)

Penny asks Leonard to lie to her father (Keith Carradine); Howard, Raj and Bernadette pull an all-nighter at a telescope.

Next Episode

The Justice League Recombination

(First Aired: December 16, 2010)

The guys try to bond with Penny's new boyfriend through a costume contest.