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Episode Details

The Big Bang Theory Season 4 Episode 10: "The Alien Parasite Hypothesis"

Amy realizes she has sexual feelings for Penny's ex on this episode. That's awkward. Meanwhile, Koothrappali and Wolowitz attempt to prove who would be the better superhero.

The Big Bang Theory Season 4 Episode 10 Quotes

Wolowitz: He got bit by a radioactive rat.
Raj: Did he get superpowers?
Wolotiz: No, he got five stitches and a tetanus shot.

Penny: He wasn't intellectually stimulating enough.
Bernadette: Couldn't you just fool around with him and then listen to NPR?
Penny: Wouldn't help. Zack couldn't even spell NPR.

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