The heroes receive dire news: prior to their original capture, Core Hunter, Voltix, XT4, and Thornaxx stole four components of what is said to be a devastating super-weapon called "The Doom Box." This device grows larger on activation, encompassing anything in its path, then collapses in on itself--a serious danger enough--but the box is capable of growing to the size of an entire galaxy! Now that the villains have escaped, they are believed to be...

On the Valiant's maiden voyage in space, it encounters a swarm of brains drifting quietly among the stars. Little does the crew know these 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.