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Penny's ex-boyfriend Zack learns that he is infertile, so he asks Leonard for help; Koothrappali attempts to mend things with his ex-fiancee Anu.
Penny's ex-boyfriend Zack learns that he is infertile, so he asks Leonard for help; Koothrappali attempts to mend things with his ex-fiancee Anu.
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S4, EP22 "The Wildebeest Implementation"Raj tries to cure his social anxiety; Penny spies on Leonard and his girlfriend through Bernadette.
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S4, EP23 "The Engagement Reaction"Howard's mom winds up in the hospital after hearing news of her son's engagement to Bernadette.
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S4, EP24 "The Roommate Transmogrification"Bernadette gets her Ph.D., inspiring the guys to tease Wolowitz about his lack of a doctorate; Raj becomes Sheldon's roommate.
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S6, EP19 "The Closet Reconfiguration"Howard considers whether he should open a letter from his father; Penny and Leonard host a "grown-up" cocktail party.
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S12, EP12 "The Propagation Proposition"Penny's ex-boyfriend Zack learns that he is infertile, so he asks Leonard for help; Koothrappali attempts to mend things with his ex-fiancee Anu.
The Big Bang Theory
S12, EP11 "The Paintball Scattering"Penny and Leonard organize a paintball game, which results in mayhem when Sheldon becomes jealous of Amy; Koothrappali catches Anu with her ex-boyfriend; Stuart doesn't want to move in with Denise.
The Big Bang Theory
S12, EP10 "The VCR Illumination"A VHS tape from Sheldon's past inspires him not to give up; Bernadette turns into a pageant mom when she tries to help Wolowitz with his Magic Castle audition.
The Big Bang Theory
S12, EP9 "The Citation Negation"Sheldon and Amy are devastated after learning from a Russian paper that Super Asymmetry has already been discovered and disproved; Bernadette wants to beat Howard in a popular video game.
