The Big Bang Theory: Season 4 Episode 10: The Alien Parasite Hypothesis
Starring: Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Carol Ann Susi
Length: 20 minutes
On Air Date: 9 Dec 2010
The Big Bang Theory: S04E10 Description: Amy finds she has sexual feelings for Penny’s ex-boyfriend Zack, while Raj and Howard try to prove who would be the better superhero.