The timestream was changed by sending a Doomsday Machine back in time. There, the Doomsday Machine destroyed several planets, manufactured more Doomsday Machines, and began what is now known as the Doomsday Wars. Captain Kirk, in command of the USS Farragut, is sent back in time to prevent this from happening and save the future. Written by
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Captain James T. Kirk
[referring to the Doomsday Machine
I don't want that thing to have any trouble finding us at the supper table.