Season 4, Episode 10 The Alien Parasite Hypothesis

First Aired: December 9, 2010

Amy is attracted to Penny's ex-boyfriend; and Raj and Howard argue about which of them would be a better superhero.

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  • Premiered: September 24, 2007
  • Rating: TV-PG
  • User Rating:4.58 out of 5 (8,996 ratings)
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  • Premise: Two nerdy physicists share an apartment and an unlikely friendship with their beautiful neighbor with whom one of them is infatuated. Like the universe after the big bang, the show's popularity expanded, thanks to breakout star Jim Parsons, along with the… (more)

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