Sonic the Hedgehog

Sonic the Hedgehog is the protagonist from the Sonic the Hedgehog series. Hailing from Planet Mobius, Sonic acted as the hero of the planet, as well as the leader of the Freedom Fighters. He is most known for his super speed, which allows him to break the sound barrier.

Worlds Collide
In the world modified by the Genesis Wave, Sonic learned of the disappearances of his friends Miles "Tails" Prower, Knuckles the Echidna, and Amy Rose. Deducing that Doctor Eggman was responsible for their disappearances, he asks the Chaotix to help him find for his friends and they start searching in different locations. While checking in the Green Hill Zone, Silver the Hedgehog appears to talk with Sonic, but he is abducted by Copy Robot, who tricks him into fighting Mega Man shortly after. Sonic believes that Mega Man is one of Eggman's Badniks due to his robotic nature, and he fights against him to discover where his friends are. Mega Man, likewise, believed him to be an incredibly advanced robot who might have been working for Dr. Wily. According to Mega Man, Sonic is faster than any of Wily's robots he had encountered by that point, most notably Quick Man and Nitro Man.

At first the two blue heroes are evenly matched, but Sonic uses the landmark and his speed for his advantage, and he manages to disable Mega Man's Mega Buster. However, Dr. Light manages to reopen the portal between the two worlds, and Mega Man returns home, taking Sonic with him. Mega Man calls Rush, Eddie, Beat and Tango to help him, using Eddie to enable his Mega Buster and recover energy. Sonic complains of Tango, who uses an attack similar to his. At one point Mega Man starts chasing Sonic with the Rush Jet, and he tries to convince Sonic to return the jewel he and his friends stole from the museum. Sonic says he didn't steal anything and states that Mega Man kidnapped his friends, who replies that he hadn't kidnapped anyone.

They were then ambushed by the Roboticized Master, Tails Man, who had secretly been observing their battle under Eggmn and Wily's orders. Sonic and Mega Man then called a truce to save the innocent civilians caught in Tails Man's attack. Afterwards, they then teamed up to attack Tails Man. After disabling Tails Man, Mega Man attempted to use his Special Weapon copying ability to find out any information on Tails Man, only for the Roboticized Master to unexpectedly revert back to his original form, Tails, when touched. Sonic is glad to see Tails again, and also learned from Tails that Wily and Eggman had teamed up and were responsible for Tails and the others' abduction. They then were teleported by Mega Man to Light Labs (with Sonic becoming queasy from experiencing the teleportation aspect from Mega Man's realm), and were eventually dispatched to the Skull Egg Zone, alongside Rush and Proto Man. They later fought against the Genesis Unit and Copy Man, easily defeating them, and eventually encountered the other Roboticized Masters.