A robot from the struggling future, a human from the war-torn past. In order to save both from destruction and ruin, a boy named Astro Atom time travels to 1960's America. In search of a soon to be hero 'Hogarth Hughes' and his robot 'Ig' the Iron Giant. Who went missing before the final fateful battle that set off a nuclear chain of events on the world. Causing those in the future to grow up in a radioactive wasteland and retreat to the skies. But now that Hogarth Hughes has the help in the form of a friendship from Astro Atom. Can they change fate and save not only those in Hogarth's past, but Astro's future as well?