Watch S4, EP10: The Alien Parasite Hypothesis with Fubo for $0 Today
Amy realizes she has feelings for Penny's ex; Koothrappali and Wolowitz try to prove who would be a better superhero.
Amy realizes she has feelings for Penny's ex; Koothrappali and Wolowitz try to prove who would be a better superhero.
How to watch
More episodes
The Big Bang Theory
S4, EP11 "The Justice League Recombination"The guys try to bond with Penny's new boyfriend through a costume contest.
The Big Bang Theory
S4, EP12 "The Bus Pants Utilization"Leonard's idea for a smartphone application causes friction in his friendship with Sheldon.
The Big Bang Theory
S10, EP17 "The Comic-Con Conundrum"Cut off from his father's fortune, Koothrappali appoints Sheldon to help him get out of debt; Penny considers joining Leonard at Comic-Con.
The Big Bang Theory
S12, EP18 "The Laureate Accumulation"When competitors Pemberton and Campbell charm America on a publicity tour, Sheldon and Amy try to win over Nobel laureates Kip Thorne, George Smoot and Frances Arnold; Halley's fear of the dark leads to opportunity and conflict.
The Big Bang Theory
S4, EP10 "The Alien Parasite Hypothesis"Amy realizes she has feelings for Penny's ex; Koothrappali and Wolowitz try to prove who would be a better superhero.
The Big Bang Theory
S4, EP9 "The Boyfriend Complexity"Penny asks Leonard to lie to her father (Keith Carradine); Howard, Raj and Bernadette pull an all-nighter at a telescope.
The Big Bang Theory
S4, EP8 "The 21-Second Excitation"While the guys camp out for a long-awaited movie screening, Penny and Bernadette invite Amy to her first slumber party.
The Big Bang Theory
S4, EP7 "The Apology Insufficiency"Sheldon's interview with the FBI jeopardizes Wolowitz's security clearance.
