In search of a super-weapon with which to rescue his Mutants from the Springers on Ice Planet, Perry is en route through the space-time continuum to the Planet of Eternal Life when he lands on Barkon.

Shortly after the beginning of time the first civilised beings had developed on Barkon. Their power expanded through the Universe, until suddenly their planet left orbit and reappeared in the farthest known galaxy. Now, hollowing out the planet to convert it into a titanic worldship, the Barkonides intend to return.....