A visit to the Space Research Centre takes a strange turn when Bobbie and Joe find themselves stepping out of the flight simulator onto an alien world. This is only the beginning of a peculiar journey through the byways of space, stopping off to explore planets and their satellites, dodging meteors, and watching out for black holes. As they travel, Joe and Bobbie slowly discover that all is not well in space, and find themselves on the trail of the evil genius Dread Lee Sirus, pitting their wits against his as they struggle to halt his plans for universal domination.