Two characters from Marvel UK's 90s revamp, from the same stable as Death's Head II, Warheads, Knights of Pendragon, Hellsangel and others.
Motormouth, aka Harley Davis was a foul mouthed runaway who got implanted with dimension hopping teleportation equipment. Killpower, aka Julius Mullarkey is a genetically engineered superbeing made with human and animal DNA, with the body of Arnie at his prime and the mental age of a child.
Cornell did say he was going to try and squeeze in some of the Marvel UK characters and I'm gratified he did so. I used to love those guys and I never imagined I'd ever see them again.