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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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S2, EP10 "The Vartabedian Conundrum"Leonard asks Penny for advice when his new relationship starts moving too fast.
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S2, EP12 "The Killer Robot Instability"When Penny's comment about Wolowitz's love life sends him into a depressed stupor, his friends lose their most important teammate in an upcoming fighting-robot competition.
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S2, EP13 "The Friendship Algorithm"Sheldon develops a scientific procedure for making friends; Kripke controls a new supercomputer.
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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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S5, EP9 "The Ornithophobia Diffusion"Leonard and Penny spend time alone; Sheldon tries to face his fear of birds.
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S5, EP8 "The Isolation Permutation"Amy is devastated when Penny and Bernadette shop for wedding dresses without her.
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S5, EP7 "The Good Guy Fluctuation"An attractive comic book artist tests Leonard and Priya's relationship; Sheldon tries to scare his friends.
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S5, EP6 "The Rhinitis Revelation"Sheldon finds himself competing with the gang for his mother's (Laurie Metcalf) attention when she visits.
