Chaos Cannon is a Special Weapon used exclusively by Shadow Man in the Sonic the Hedgehog and Mega Man comic crossover event, Worlds Collide. Essentially a weaponized version of Chaos Control, Shadow Man can freeze his opponents with a dark blue barrier. This can freeze the opponent until Shadow Man is distracted from the foe, at which point the foe can escape the barrier. When using this move, Mega Man adopts a red and black attire, which matches Shadow's color scheme.
While Sonic the Hedgehog, Mega Man, Miles "Tails" Prower, and Rush explored Skull Egg Zone to find the remaining Roboticized Masters, the heroes encountered the Roboticized Master Shadow Man and the Robot Master Shadow Man. During the fight, the Roboticized Master Shadow Man attacked Sonic with the Chaos Cannon and Mega Man then decided to attack the Roboticized Master. He used the Chroma Camo Special Weapon to dodge the Chaos Cannon attacks, and then used his Tails Wind Special Weapon to stun the Roboticized Master Shadow Man so that Sonic could escape the Chaos Cannon's barrier. When Mega Man returned Shadow Man back to Shadow the Hedgehog with the Sonic Shot, Mega Man absorbed the Chaos Cannon Special Weapon to surround the other Shadow Man. (WC #7)