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In a 22nd century, Toby Tenma is a teenager who lives in the futuristic city-state of Metro City, which floats above the polluted surface on Earth. His father, Dr. Tenma, works at the Ministry of Science, alongside Dr. Elefun. They create the Peacekeeper, an advanced defensive robot that is powered using the Blue and Red spheres, two powerful energy cores that emit respective opposing positive and negative energy, discovered by Dr. Elefun. The two scientists brief the President of Metro City, Stone, who is running for re-election. Against the scientists' warnings, Stone loads the negative Red Core into the Peacekeeper, causing it to become rampage. Toby is accidentally killed by the Peacekeeper, as it attempts to violently leave the research facility before it is put down by Dr. Elefun.

A distraught-driven Tenma revives Toby as a robot programmed with all his memories, but also makes his body with built-in defenses to protect him. Powered by the Blue Core, the robot activates and believes himself to be Toby, but although he has his original mind and a similar personality, Tenma realizes he could never be revived as the son he lost. Toby discovers his new robot capabilities including the ability to understand non-talking robots and rocket-powered flight. Stone has his forces pursue Toby, but the chase leads to him falling off the city's edge when Stone's flagship blasts him with missiles. Meanwhile, Tenma escapes arrest by agreeing to disable Toby and give up the blue core.