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The Big Bang Theory
Season 4 · Episode 10
The Alien Parasite Hypothesis
7.420mDecember 9, 2010
Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.
Episodes
- Episode 1The Robotic Manipulation
- Episode 2The Cruciferous Vegetable Amplification
- Episode 3The Zazzy Substitution
- Episode 4The Hot Troll Deviation
- Episode 5The Desperation Emanation
- Episode 6The Irish Pub Formulation
- Episode 7The Apology Insufficiency
- Episode 8The 21-Second Excitation
- Episode 9The Boyfriend Complexity
- Episode 10The Alien Parasite Hypothesis
- Episode 11The Justice League Recombination
- Episode 12The Bus Pants Utilization
- Episode 13The Love Car Displacement
- Episode 14The Thespian Catalyst
- Episode 15The Benefactor Factor
- Episode 16The Cohabitation Formulation
- Episode 17The Toast Derivation
- Episode 18The Prestidigitation Approximation
- Episode 19The Zarnecki Incursion
- Episode 20The Herb Garden Germination
- Episode 21The Agreement Dissection
- Episode 22The Wildebeest Implementation
- Episode 23The Engagement Reaction
- Episode 24The Roommate Transmogrification