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Space Seed

The Enterprise discovers a derelict vessel which turns out to be an Earth ship dating back to a series of wars in the 1990s in which Earth's population was threatened by a group of genetically engineered superhuman beings. The inhabitants of the rogue ship, though they try to conceal the fact at every opportunity, are the only surviving oppressors from that war. Their leader, Khan, wishes to resume their reign of terror, beginning with a takeover of the Enterprise.

The Original Series, seizoen 1