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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.

The group is stunned to find a beautiful woman in Sheldon's office, only to discover she is his twin sister. Watch www xrysoi se The Big Bang Theory S01E15hd

Missy asserts her independence by using "childhood conflict methods"—essentially kicking Sheldon in the groin—to force him to stop interfering in her dating life. Leonard attempts to manipulate Sheldon by arguing that