On the Valiant's maiden voyage in space, it encounters a swarm of brains drifting quietly among the stars. Little does the crew know thse strange creatures have the ability to control the minds of anyone they touch. The ship is quickly taken over by the hostile life-forms, and the Valiant begins rocketing through space on a collision course with one target: the Hero Factory in Makuhero City.

Stormer sends Bulk and Furno to investigate why their planet can no longer communicate by radio and to find out what happened to Stringer, who sent a warning message from Tranquis VII and then vanished.