The Big Bang Theory
S04E10 The Alien Parasite Hypothesis
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.
Season 4 Episodes
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The Robotic Manipulation
The Cruciferous Vegetable Amplification
The Zazzy Substitution
The Hot Troll Deviation
The Desperation Emanation
The Irish Pub Formulation
The Apology Insufficiency
The 21-Second Excitation
The Boyfriend Complexity
The Alien Parasite Hypothesis
The Justice League Recombination
The Bus Pants Utilization
The Love Car Displacement
The Thespian Catalyst
The Benefactor Factor
The Cohabitation Formulation
The Toast Derivation
The Prestidigitation Approximation
The Zarnecki Incursion
The Herb Garden Germination
The Agreement Dissection
The Wildebeest Implementation
The Engagement Reaction
The Roommate Transmogrification