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.
The Big Bang Theory
The Alien Parasite Hypothesis
season 4 episode 10
episode aired on december 2010
Episode rating
Cast of episode
62
31
3
2
1
1
- Sheldon Cooper
- Amy Farrah Fowler
- Raj Koothrappali
- Leonard Hofstadter
- Howard Wolowitz
- Penny
- Bernadette Rostenkowski
- Zack Johnson