The timestream was changed by sending a Doomsday Machine back in time. There,...
Star Trek Phase II
Season 1 Episode 1: In Harm's Way
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...