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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, EP15 "The Benefactor Factor"A wealthy donor makes Leonard question what he is willing to do for science.
The Big Bang Theory
S4, EP16 "The Cohabitation Formulation"Wolowitz considers taking things with Bernadette to the next level; Leonard and Raj's sister rekindle their relationship.
The Big Bang Theory
S4, EP17 "The Toast Derivation"Sheldon is upset when he realizes Leonard is the center of their group of friends.
The Big Bang Theory
S12, EP14 "The Meteorite Manifestation"Sheldon is thrilled to help Bernadette and Wolowitz navigate bureaucratic paperwork, until he discovers they are breaking the law; Leonard is disappointed when his friends exclude him from a scientific project.
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.
