The Iron Giant(1999)

Set in the fictional town of Rockwell, Maine, Hogarth Hughes is a bright and adventurous little boy who rescues and befriends a huge, metal-munching, but lovable iron robot who has gotten himself tangled up the in high-tension wires behind his home. When the townsfolk begin to wonder why their automobiles and tractors are often found with large bites taken out of them, they begin to hunt for the culprit and soon the gentle giant is the number one enemy of the Army, Navy, Air Force and Marines.