Powers: super-dense reptilian skin; heightened strength, agility, and endurance.
Bio: Little is known about Mellencamp's past, save that he was severely and inhumanly abused and mistreated as a child due to his developing mutation. He is loyaly devoted to Magneto and his teachings that mutants are superior to humans, so much so that he has been referred to as the "Noble Knight of the Acolytes." During his first battle with the X-Men, Mellencamp is defeated by Jean Grey. She uses her telekinetic powers to throw him many miles away. As Mellencamp was invulnerable, he survives this attack. In his second conflict with the X-men allied group X-Factor, he tries to kill Multiple Man. In self-defense, Multiple Man creates a duplicate of himself within Mellancamp's body, supposedly killing him.
Mellencamp returns without explanation in the pages of Heroes for Hire #16. (In the pages of Quicksilver a possible explanation was given: the Acolytes leader Exodus claims to have the ability to resurrect the dead Acolytes.) Mellencamp remains an Acolyte over the next few months and follows Magneto when he takes over the island state of Genosha. Genosha and its inhabitants were nearly all exterminated by Sentinels