The Invisible Boy (aka S.O.S Spaceship) is a 1957 American science fiction film from Metro-Goldwyn Mayer, produced by Nicholas Nayfack, directed by Herman Hoffman, and starring Richard Eyer and Philip Abbott. It is the second film appearance of Robby the Robot, the science fiction character who "stole the show" in Forbidden Planet (1956), also released by Metro-Goldwyn-Mayer. According to an implied, subtle back story in The Invisible Boy, the robot is the same character as that in Forbidden Planet, which is set in the 23rd century; Robby is brought back to the film's mid-20th century era by time travel.
The Invisible Boy is a mixture of lighthearted playfulness and menacing evil. As it begins, ten-year-old Timmie Merinoe (Eyer) seems only to want a playmate. After he is mysteriously invested with superior intelligence, he reassembles a robot that his father and other scientists had been ready to discard as unrepairable 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, the Robby, with the aid of a supercomputer, makes him invisible. At first Timmie uses his invisibility to play simple pranks on his parents and others, but the mood soon changes, when it becomes clear that the supercomputer is evil and intends to take over the world using a military satellite.
According to MGM records, the film earned $390,000 in the US and Canada and $450,000 elsewhere, for a total of $840,000. With a budget of $384,000 this resulted in a profit of $456,000.
The entire feature film appears as an extra on the Forbidden Planet 50th Anniversary DVD released in 2006 and on the Blu-ray released in 2010.