>>9207699>>9208285Spider-Man found a lights-on ultron head in the Avengers Vault he gets locked in.
The current conspiracy theory is that it hints that Ultron is still alive and or active at least in remaining physical drones.
The fan theory is he goes crazy as a head trapped in a box in the basement and eventually frees himself as a much angrier, more ruthlessly murdery version of the AoU character.