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Unreliable citations may be challenged or deleted. This article possibly contains original research. Assignment: Earth» is the last episode of the second season of the American science fiction television series Star Trek. Engaged in «historical research», the Enterprise time travels to 1968 Earth where they encounter an interstellar agent planning to intervene in 20th century events with motives uncertain to Kirk and Spock. The episode served as a backdoor pilot for a proposed spin-off television series, produced by Roddenberry, also to be called Assignment: Earth.
The Federation starship USS Enterprise, which has time-travelled to Earth in 1968 for historical research, intercepts a powerful transporter beam originating from one thousand light-years away. Seven, with the help of his «servo», escapes from the brig and beams down to an office in Manhattan, emerging from a vault. Activating a computer, he identifies himself as Supervisor 194 and inquires as to the whereabouts of Agents 201 and 347, who he learns have not been heard from in three days. Seven decides to complete their mission. A young woman arrives, whom Seven mistakes for Agent 201. Kirk and Spock track Seven to his office. Roberta stalls them while he and his cat enter the vault and dematerialize.
Riding the elevator to the top of the gantry, Seven climbs an access arm to the side of the rocket, opens a panel, and begins to rewire the circuits. As they are questioned, the missile carrying the nuclear weapons platform is launched. In New York, a curious Roberta explores the office and accidentally discovers the hidden vault. Seven takes control of the missile, arming its warhead and bringing it off course.
After a failed attempt to call the police, Roberta bludgeons Seven with a heavy cigar box and seizes the servo. Seven pleads with her to allow him to proceed, «or in six minutes, World War III begins! Scotty beams Kirk and Spock from the base to Seven’s office. Roberta, now trusting Seven, points the servo at Kirk, but Seven surrenders it, noting that it was «set to kill».