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Originally posted by: TheSessler
Well Callista was imprisoned in a computer controlled imperial ship that went around collecting force sensitives and jedi, she died and her spirit took over some random teenage Jedi student and Luke was still in love with her.

That's close, but not quite there.

The Imperial ship was to pick up Imperial troops from specific planets, then indoctrinate them to hate Jedi so the ship and the troops could attack one of the last jedi outposts. When Callista got to the ship and into its computer, she delayed the mission.
After years, the troops died or left, and when the ship finally tried to execute its mission, it picked up any random sentient life that was nearby it when it reached a planet, including Gamorreans, Jawas, Luke and others.