The episode of The Big Bang Theory you are looking for is titled . In this episode, Sheldon's fraternal twin sister, Missy , visits him at the university, leading to a comedic competition among Leonard, Howard, and Raj for her attention. Key Plot Points
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Raj participates in a pharmaceutical study to overcome his selective mutism around women. The drug works but has visible side effects, including involuntary hand gestures. The episode of The Big Bang Theory you