Toby Tenma is a teenage boy who lives in Metro City, a futuristic city-state that floats above the now-polluted surface of the earth. Toby's father, Dr. Tenma, is a famous roboticist and Minister of Science, but has a distant relationship with Toby. Dr. Tenma meets the city's obstructive and corrupt leader President Stone to demonstrate a new, advanced defensive robot called the Peacekeeper, to be powered by Dr. Tenma's best friend Dr. Elefun's newest creations, the Blue and Red Cores, two energy cores that emit respective opposing positive and negative energy. Against the scientists' warnings, Stone, desperate to win re-election, loads the Red Core into the Peacekeeper. This causes it to go berserk and Toby, who had snuck into the room, is accidentally disintegrated by the Peacekeeper before it can be shut down.
