When an alien emperor deems to destroy Earth due to the disappearance of his daughter, Ben must use Alien X to restore order, but not everything goes according to plan.

The team is confronted by a Plumber Magister who accuses them of impersonating Plumbers. Meanwhile, a new foe allies himself with a HighBreed commander.

During battle, Ben and a HighBreed commander are teleported to a distant world. They must put their differences aside if they're going to have any chance of finding a way to return to Earth.