When a $5 billion Space Agency probe disappears into an intergalactic wormhole, the agency recruits Ham III, grandson of the first chimpanzee in space, to help retrieve the wayward craft. But Ham is a free-spirited circus performer more interested in zero gravity high jinks than living up to his illustrious heritage. The simian slacker becomes a reluctant hero and learns the true meaning of courage as he and his crewmates, the fearless Lt. Luna and their uptight commander, Titan, risk everything in an effort to save the peaceful inhabitants of a distant planet from an evil dictator.