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Leonard attempts to manipulate Sheldon by arguing that Missy should date someone with "superior DNA" to ensure the Cooper lineage continues with more geniuses.

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.

Missy mentions a childhood incident where Sheldon built a robot to keep her out of his room, even though Young Sheldon later established they shared a bedroom.

This episode introduces Missy Cooper, who becomes a recurring character and a major part of the prequel series Young Sheldon .

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

The group is stunned to find a beautiful woman in Sheldon's office, only to discover she is his twin sister.