History: 

(Adventures of Superman #441) - Metallo stormed a Lex-Oil in Australia, and went into a fury when he couldn't find what he was looking for, killing a security guard and wrecking the plant.

(Superman: The Man of Steel #12) - Metallo's remains were being transported to Stryker's prison when Cerberus sent one of his cyborgs to attack the armored transport vehicle and rescue Metallo.

(Damage #1) - Steelhawk, an employee of Symbolix, broke Metallo s head out of prison and outfitted him with a new robot body powered by plutonium. He told Metallo had hired him to kill Grant Emerson, a boy who  recently gained superpowers. Metallo smashed through Grants classroom at Nathan B. Forest High and attacked him. Metallo told him it was nothing personal, but he had a rep to protect. Grant defeated Metallo, shattering his robot body and destroying a good part of the school after he lost control of his newfound powers and exploded.

(Action Comics I #710) - Conduit freed Metallo and equipped him with a new body powered by geomagnetics, keeping him invulnerable while in contact with the earth. Conduit sicced him on Superman, but after their battle Superman removed Metallo's head from his body, and bystanders wanted to play soccer with it, humiliating the villain.

(Superman / Batman #1) - On his birthday Metallo broke into S.T.A.R. Labs looking for his mortal remains. His body wasn't there, but he learned it was buried in Gotham City, his old stomping grounds. He dug up his body, but was confronted by Superman and Batman. He told them to mind their business, but when they wouldn't back down he shot Superman with a kryptonite bullet. He fell into an open grave, and Batman removed the bullet, but Metallo buried them both in the grave.

(Superman / Batman #7) - Toyman Hiro Okomura captured Metallo, because the Metallo that made up his body was the property of Toyman's late grandfather. He cloned a new human body for Metallo, but left him with a kryptonite heart. Metallo thought being human would make him act human, but he learned that he was as mentally sick and twisted as ever. He stole one of Toyman's techbots and went on a tear through Tokyo until Superboy and Robin stopped him.

(Enginehead #4) - The mad scientist Mechanic created Enginehead, a perfect melding of machine and man. Metallo had a dream about Enginehead, and was convinced he could help restore his humanity. He attacked Enginehead at a strip club, demanding and begging that Enginehead turn him back into a man. Enginehead short-circuited him, and he wandered off in a daze.

Comments: Created by Robert Bernstein & Al Plastino.

Metallo received a profile in Who's Who Update '87 #4 and Who's Who in the DC Universe #13.

Metallo had a cameo in Adventures of Superman #427, Damage #0, and Secret Files President Luthor #1.

The storyline in Superman / Batman #2 strongly suggested that it was Metallo in his days as a petty thief that killed Martha and Thomas Wayne. In the post Infinite Crisis DC Universe it was Joe Chill that murdered Batman's parents, just as it was in the pre Zero Hour DCU, removing Metallo's involvement in their deaths from continuity.

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