Hammerhead
From Spider-Man Wiki
Hammerhead began his career as a junior hit-man, working for the Maggia. When his head was shattered in a brawl, Jonas Harrow discovered him in an alley, and operated on him - replacing his broken skull with one made of steel.
Upon awakening, Hammerhead became infatuated with the 1920's movie poster which was the last thing he saw before the brawl, and adopted the role of the mobster "Hammerhead", favoring 20's clothing and weaponry, and the talk and behavior of the criminals of that time. Needless to say, Hammerhead had a screw or two loose in that metal skull of his. He no longer remembered his real name.
Hammerhead was first seen during the major gang war[1], after Wilson Fisk decided to lay low - leaving the way open for Doctor Octopus and Hammerhead to lay their claims as his replacement.
Hammerhead was also involved with Doc Ock when Otto attempted to woo Peter Parker's Aunt May. The events of that story caused him to become a "ghost", who returned in the "Ghost of Hammerhead" storyline. Hammerhead was also a player in the second "Gang War" storyline, around ASM #284 and following. He survived, and then allied himself with Chameleon in the Lobo Brothers gang war story line around Spectacular #153 et. al.
He returned again, as part of the Hydra/Fortunato/Jimmy Six gang war storyline in Spider-Man #71 and following. He also appeared in the "Spider-Man: Lifeline" three part Limited Series.
During the events of the Civil War, Hammerhead used the vacuum left by the incarceration of the Kingpin to gain a greater foothold in the ranks of organized crime, attempting to organize an army of costumed villains (consisted of the Ani-Men V, Answer I, Aura, Bloodshed, Clown, Cyclone III, Discus, Electro, Great Gambonnos, Kangaroo II, Man Mountain Marko, Mauler, Mindblast, Override, Ringmaster, Stiletto, Spot, Squid, Trapster, and Will O' The Wisp) to enforce his new criminal empire. The Kingpin manipulated various hero factions, most notably S.H.I.E.L.D. and Iron Man into breaking up Hammerhead's first convening of his army. During the conflict, Hammerhead was shot numerous times by Fisk's agent Underworld, who later confronted Hammerhead while he lay in prison. Underworld then shot Hammerhead at point-blank range with adamantium bullets.
The bullets, while not penetrating his skull, did cause severe trauma to his brain, resulting him in needing surgery, but the hospital he was brought to was unable to treat him. In mid-surgery however, men working for Mister Negative came in, killed the hospital staff, and took Hammerhead away. Negative then had his surgeon, Doctor Tramma, revive Hammerhead, and offered to transplant his brain into a new robotic adamantium skeleton, which Hammerhead agreed to.
