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The Big Bang Theory S04E10

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The Big Bang Theory : The Alien Parasite Hypothesis

S04, E10 ()

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

TV-14  (D, L)

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Previous Episode

The Boyfriend Complexity

S04, E09 (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

S04, E11 (First Aired: December 16, 2010)

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