 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.The Supercomputer takes Timmie captive aboard the rocket, the army tries to stop Robby, but all of their artillery and weapons have no effect on him.Robby boards the ship, but frees Timmie rather than listening to the supercomputer.