Theme parks. Millions visit them every year to have fun and live out their happiest fantasies amidst colorful characters, lights and rides. But where can people go to safely express their darker natures? What would happen to violent crime if such a place existed? Set in the near future, this sci-fi thriller takes place within the confines of Gangster World, a computer-run theme park where people can be as violent as they please with androids who are programmed not to seriously injure them back. The brainchild of Dr. Greenstreet, the park has caused a marked decrease in crime. Wanting to make the park fully automated, Dr. Greenstreet hires programming prodigy Garland Widmark. The project goes smoothly until the mysterious Outsider shows up on the eve of the park's grand re-opening. Suddenly human park guards are found slain and the androids begin playing for real. Widmark and his partner Lita Hayworth have no choice but to enter the park themselves to find out what is going on. It is then that Widmark discovers he has been marked for assassination by the Outsider and every android in the park. Matters become more tense when Lita is abducted and held hostage. If Widmark does not do something soon, deadly chaos will reign at the park.