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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.
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.
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The Big Bang Theory
S3, EP9 "The Vengeance Formulation"After being humiliated on the radio, Sheldon vows to destroy Kripke; Wolowitz tries not to ruin his new relationship with Bernadette.
The Big Bang Theory
S3, EP10 "The Gorilla Experiment"Sheldon tries to help Penny understand Leonard's work; Wolowitz gets jealous when Leonard starts hanging out with his new girlfriend.
The Big Bang Theory
S3, EP11 "The Maternal Congruence"Leonard is horrified when his mother (Christine Baranski) visits.
The Big Bang Theory
S4, EP23 "The Engagement Reaction"Howard's mom winds up in the hospital after hearing news of her son's engagement to Bernadette.
The Big Bang Theory
S4, EP22 "The Wildebeest Implementation"Raj tries to cure his social anxiety; Penny spies on Leonard and his girlfriend through Bernadette.
The Big Bang Theory
S4, EP21 "The Agreement Dissection"Priya dissects the roommate agreement; the ladies take Sheldon dancing.
The Big Bang Theory
S4, EP20 "The Herb Garden Germination"Amy and Sheldon spread gossip as part of an experiment; Howard decides to take a big step in his relationship with Bernadette.
The Big Bang Theory
S4, EP19 "The Zarnecki Incursion"The guys try to figure out who hacked Sheldon's online-game account.
