The SPT Lazner is a super-powered, computerized Tracer robot. It is the strongest robot in the universe. The story's hero, Eiji, is the child of an earthman and an alien from another planet. He happens to find out about a conspiracy to destroy the earth. Using Lazner and with his friends’ help, Eiji decides to save his father's planet earth and fight against his mother's planet to achieve peace in space.