A.k.a The Scorpion. Paid to go through an experimental animal mutation therapy by J. Jonah Jameson, Mac went insane. But, he also got super powers. Not a bad pay off. His costume has changed over the years, making it more Scorpion like. I stuck with the original. Recently he's been delegated to a sort of second tier Spidey bad guy. Actually, he's the new Venom... Not for me. For my money, he's still the same wall smashing lunatic that I loved as a kid. I'll get you Spider-man!