Assignment: Earth

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During a historical research mission in 1968, the Enterprise encounters Gary Seven, a human from the 20th century raised on an advanced alien planet who appears to be attempting to alter history. The Enterprise is on its mission to observe the Earth in 1968 when it beams aboard a mysterious man named Gary Seven. Gary wants to get back to the Earth's surface, but the Enterprise command crew are unable to decide how to proceed. Seven tricks the guards and escapes, leading Kirk and Spock to beam down to the Earth's surface. History suggests that on this day, a crucial spacecraft launch failed in the US that changed the course of history. But Kirk and Spock fail to realize that Seven is trying to help the events take place and not stop them. Using his secret portal, Seven is able to reach the launch site and install the device that will cause the mission to fail.

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