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When Sheldon tries to prove his mental superiority as they train for the Physics Bowl, the guys kick him off the team and bring his nemesis (Sara Gilbert) aboard.
When Sheldon tries to prove his mental superiority as they train for the Physics Bowl, the guys kick him off the team and bring his nemesis (Sara Gilbert) aboard.
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S1, EP14 "The Nerdvana Annihilation"Leonard and the guys buy a time machine prop from a classic movie; Penny tells the guys their obsession with comics and toys is pathetic.
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S2, EP14 "The Financial Permeability"Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
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S2, EP15 "The Maternal Capacitance"Leonard and Penny are drawn together after a disastrous visit from Leonard's mother (Christine Baranski).
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S2, EP16 "The Cushion Saturation"A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
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S4, EP18 "The Prestidigitation Approximation"Leonard has to choose between Penny and his new girlfriend, Priya; Howard's magic trick drives Sheldon crazy.
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S4, EP17 "The Toast Derivation"Sheldon is upset when he realizes Leonard is the center of their group of friends.
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S4, EP16 "The Cohabitation Formulation"Wolowitz considers taking things with Bernadette to the next level; Leonard and Raj's sister rekindle their relationship.
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S4, EP15 "The Benefactor Factor"A wealthy donor makes Leonard question what he is willing to do for science.
