The film is about a spaceship that is redirected to investigate some weird transmissions. On the way¸ the ship is attacked by robotic ships and it limps its way to a nearby planet--dominated by an evil robot that looks like a giant slot machine. This horrible robot and the computer that controls it have ravaged this planet and the surviving locals are unable to do anything but hide in caves and hope to survive. Well¸ the Earthlings are apparently made of finer stuff and one of them tosses a rock at the robot--thus destroying it AND causing a chain reaction that destroys the planet!! Well¸ this isn’t all of it¸ as the evil computer isn’t quite through with this crew¸ but I don’t want to say more lest I spoil the great suspense!