 After he is mysteriously invested with superior intelligence, he reassembles a robot that his father and other scientists had been ready to discard as irreparable junk.No one pays much attention to the robot, named Robby, after Timmie gets it operating again, until Timmie's mother becomes angry when her son is taken aloft by a huge powered kite that Robby has built at Timmie's urging.When Timmie expresses a wish to be able to play without being observed by his parents, Robby, with the aid of a supercomputer, makes him invisible.