The robot named Rex had been bought as a companion for Paul when theSimpsons decided to pioneer on Ganymede, a moon of Jupiter...a rough, dangeroussatellite where a small boy needed a strong, intelligent robot to protect him.By the time Paul is sixteen, they are inseparable. Robots, of course, have apersonality leeway that gives each one a certain individuality within itspattered capacities — and Rex had a wonderful personality, with a logicquotient that allowed him to reason. But when the Simpson family is ordered backto Earth and Paul refuses to part with Rex, the robot plans to stow away on aspaceship to Earth — no easy feat, even for a robot with Rex's abilities.Thrilling chases in skimmers, through spaceports, and over the deserts of Marsare just the start of the problems for The Runaway Robot!