In October of 1957 in the small town of Rockwell, Maine. Annie Hughes (voice of Jennifer Aniston) is a single mother working at the local diner, Annie has her hands full with her son Hogarth (Eli Marienthal) - headstrong and imaginative, always on the lookout for the latest attempted takeover by mutant aliens or invaders. So when a local fisherman comes into the diner with a tale about a huge metal man falling into the sea, the only one to pay him much attention is Hogarth, who goes exploring for the enormous robot. He finds a 50-foot giant with an insatiable appetite for metal and a childlike curiosity about its new world. Rumours of everything from an alien invasion to a Russian secret weapon sent to destroy Rockwell soon spread through the town, prompting the arrival of government agent Kent Mansley (Christopher McDonald). Hogarth convinces his beatnik friend Dean (Harry Connick, Jr) to hide the Iron Giant (Vin Diesel) in Dean's junkyard. But the rumours soon turn into paranoia; the situation escalates; and the possible destruction of Rockwell looms. Hogarth turns to his friend, the Iron Giant, who ultimately finds his humanity by unselfishly saving the town's residents from their own fears and prejudices.