Star Trek: The Original Series, season 1, episode 22
Space Seed
Summary
The Enterprise discovers an ancient sleeper ship, the SS Botany Bay, which escaped from Earth's Eugenics Wars in the late 20th century. The genetically engineered passengers, led by war criminal Khan Noonien Singh, seize control of the Enterprise and attempt to destroy the ship. (This episode serves as the backstory to the second Star Trek film.)
Summary from Wikipedia, CC BY-SA 4.0.
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