The Alien Parasite Hypothesis (S04E10)
S04E10
Amy discovers she has romantic feelings for Penny's former boyfriend, creating an awkward situation. Meanwhile, Koothrappali and Wolowitz engage in a friendly rivalry as they compete to determine who would make the superior superhero.
Show
The Big Bang Theory
Episode
S04E10
Air Date
Dec 09, 2010
Season 4 Episodes
S04E01
The Robotic Manipulation
S04E02
The Cruciferous Vegetable Amplification
S04E03
The Zazzy Substitution
S04E04
The Hot Troll Deviation
S04E05
The Desperation Emanation
S04E06
The Irish Pub Formulation
S04E07
The Apology Insufficiency
S04E08
The 21-Second Excitation
S04E09
The Boyfriend Complexity
S04E10
The Alien Parasite Hypothesis
S04E11
The Justice League Recombination
S04E12
The Bus Pants Utilization
S04E13
The Love Car Displacement
S04E14
The Thespian Catalyst
S04E15
The Benefactor Factor
S04E16
The Cohabitation Formulation
S04E17
The Toast Derivation
S04E18
The Prestidigitation Approximation
S04E19
The Zarnecki Incursion
S04E20
The Herb Garden Germination
S04E21
The Agreement Dissection
S04E22
The Wildebeest Implementation
S04E23
The Engagement Reaction
S04E24
The Roommate Transmogrification