Winnie the Pooh meets The Iron Giant

On October 4 1957, a giant metal robot crash-lands just off the coast of "Rockwell" (Rockland), Maine. In a hurricane, the Giant is seen by a man in a boat, who narrowly survives by washing up on land by the Rockwell lighthouse.

On October 5, the big metal man eats a television antenna from a house dangerously close to the woods, the nine year old boy who lives there, Hogarth Hughes, follows its huge footprints into the Hundred Acre Wood (whom meets Pooh, Simba, Genie, Cartman and the gang). There, the Giant becomes entangled in wires at a power station, shocking it. Hogarth shuts off the power, saving the robot.

On October 6, Pooh reunites with Belle as she helps Hogarth and Pooh find the robot again, and it follows him to his house. On the way, the Giant discovers train tracks. He attempts to eat them, but Hogarth explains that train tracks are off limits. While trying to fix the tracks, an upcoming train collides with the Giant. Hogarth panics, as the collision caused the robot to lose its arm and a jaw bolt, but he realizes that the Giant is assembling itself back together because of an apparent repair signal from its head. Meanwhile, Kent Mansley, a pompous, self-centered and extremely paranoid U.S. Governm On October 7, Kent eventually rents a room in the Hughes' house and begins to constantly plague Hogarth with questions about what he knows about the Giant before an exasperated Hogarth has to take him to a diner. There, Kent goes on an angry rant at Hogarth to tell him about the Giant's location, but Hogarth manages to escape to the scrap yard after Kent rushes to the restroom following Hogarth lacing his malt with chocolate laxatives. Hogarth and the Giant have fun together, but later Hogarth explains the concept of life and death and that guns kill after hunters shoot a deer in the woods. The Giant becomes somewhat despondent after he learns that all things, even his new friend, will eventually die, but is comforted when he learns that souls, which give living things life, never die.

Mansley finds Hogarth's camera, which he dropped in the woods. He develops the photos, and sees a photo of the Giant. He intimidates Hogarth and Pooh into revealing the Giant's hiding place by threatening to have him put into care and his mother charged with criminal neglect. To cover up the interrogation with the illusion of a nightmare, Mansley puts a chloroform-laced cloth over Hogarth's nose, knocking him out. Mansley calls General Rogard and convinces him to lead a brigade to Rockwell. After regaining consciousness, and overhearing of the military coming to Rockwell, Hogarth and Pooh attempts to warn Dean and the Giant. However Mansley, having pre-medidated Hogarth's thoughts, catches him trying to leave and has prevented his escape by nailing Hogarth's bedroom window shut.

On October 8, Mansley eventually falls asleep and thinks he has won, only to find that Hogarth and managed to slip out while he was asleep by placing pillows and his army helmet in his bed. When the army gets to Dean's junkyard, Mansley is shocked to see that Dean and Hogarth disguised the Giant as a massive iron statue to throw them off once they got there. Rogard then becomes infuriated with Mansley for wasting his time and government money for nothing, and the army and a now fired Mansley leave. After the army leaves, an accident occurs when the Giant's weapons system nearly vaporizes Hogarth who is pretending to shoot the Giant with a toy gun, but Dean saves him as Kenny saves Belle. Dean angrily explains the Giant is dangerous. Striken with shame after Dean calls him "a big gun", the Giant runs off. Dean soon realizes the Giant was acting defensively, and that his weapons were unintentionally activated in reaction to the toy gun Hogarth was using, and assists Hogarth and Pooh to find the Giant.

The climax ensues when Mansley sees the Giant in town and convinces the military to attack him. The Giant had just saved two young boys from falling off a building in the town, making citizens realize he was good, when the army begins their assault on the robot. In the ensuing pursuit, Hogarth is knocked unconscious. The Giant, misinterpreting this as death, is overcome by his grief and anger, and when Mansley leads another attack on him, the Giant decides to avenge Hogarth and transforms into a heavily armed battle machine, armed with lethally powerful weapons, and begins to lay waste to the U.S Army vehicles in retaliation. When Rogard realizes his troops are no match for the weapon-bound Giant, Mansley suggests using a nuclear missile to destroy it, with the USS Nautilus equipped to fire. Rogard consents and they plan to lure the Giant away from the town so as to avoid collateral damage. Hogarth recovers and convinces the Giant to halt and cease its attack: overwhelemed that its friend is alive and reminded of the potential tragedy of its attacks, the Giant deactivates its weapons. Dean confronts Rogard and tells him that the Giant's weapons went active due to the army's ballistic attacks (which triggered the Giant's defense mechanism). The Army backs down, allowing the Giant to be pacified and calm to seemingly return. Mansley however, having become increasingly frustrated and frantic in trying to convince the General to destroy the Giant, blindly seizes Rogard's radio transceiver and orders the Nautilus to launch, neglecting to realize until too late that the Giant is now in the center of Rockwell, and that the bomb will not only destroy the Giant, but Rockwell and all the citizens, including himself and the Army. Mansley verbally shuns his patriotism, and makes a cowardly attempt to save himself, but is quickly stopped and arrested. As the townspeople of Rockwell await destruction, the Giant, remembering the death of the deer and Superman's stories of heroism, decides he must sacrifice himself to save the town by intercepting the missile, and says goodbye in his own way to a stunned and sorrowful Hogarth. The Giant takes off toward the upper atmosphere. As he flies near the missile, he recalls Hogarth's words, "you are who you choose to be." Before he collides with the missile, he utters "Superman" and closes his eyes with a smile on his face. The Giant collides at full speed with the missile, which explodes above the atmosphere, apparently destroying the Giant but sparing the town. Belle then tells Kenny that he was pretty brave and kisses him which makes Kenny blush.

On January 4 1958, a memorial statue has been erected in the Giant's honor. Dean and Annie appear to be in a relationship, presumed married, and Hogarth has made some new friends. He is sent a single jaw-screw by Rogard, the only piece of the Giant recovered from the explosion. In bed that night, Hogarth wakes up and sees that the screw has disappeared from the box it was kept in. While searching under his bed for it, he hears a beeping and tapping noise at the window. The screw is bumping against the glass, apparently attempting to travel somewhere. Smiling and realizing what the piece's activity means, Hogarth opens the window and lets it roll away. The movie ends with the Giant's body parts making their way to the Langjokull glacier in Iceland, summoned there by the repair signal in the Giant's head, which opens its eyes and smiles as it reassembles itself.