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Leonard, Sheldon, Wolowitz and Koothrappali attend Penny's Halloween party.
Leonard, Sheldon, Wolowitz and Koothrappali attend Penny's Halloween party.
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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
S5, EP7 "The Good Guy Fluctuation"An attractive comic book artist tests Leonard and Priya's relationship; Sheldon tries to scare his friends.
The Big Bang Theory
S6, EP5 "The Holographic Excitation"The gang heads to Stuart's comic book store to celebrate Halloween; Leonard uses science to seduce Penny.
The Big Bang Theory
S12, EP6 "The Imitation Perturbation"When Wolowitz dresses up as Sheldon for Halloween, Sheldon seeks retaliation at Leonard and Penny's Halloween party; Leonard is shocked when Penny doesn't remember their first kiss.
The Big Bang Theory
S8, EP23 "The Maternal Combustion"When Sheldon's and Leonard's mothers finally meet, personalities collide; Howard decides to do his share of the chores -- with a little help from his friends.
The Big Bang Theory
S8, EP22 "The Graduation Transmission"Wolowitz questions his engineering skills after he and Sheldon can't get a toy drone to fly; a canceled flight puts Leonard's plans in jeopardy; Raj sets his parents against one another after he's cut off financially.
The Big Bang Theory
S8, EP21 "The Communication Deterioration"The guys fight over what message Raj should write for NASA in case of alien contact; Penny has to decide between auditioning for a movie or keeping her pharmaceutical sales job.
The Big Bang Theory
S8, EP20 "The Fortification Implementation"Sheldon and Amy build a blanket fort -- and come to a crossroads in their relationship; Wolowitz meets a half-brother he didn't know he had; Leonard and Penny have an argument during an appearance on Wil Wheaton's podcast.
