Metallo is a recurring antagonist of Superman. The best known version of Metallo is John Corben, who first appeared in Action Comics #252 (May 1959). John Corben was a journalist and criminal who while fleeing from the scene of a murder he committed, ended up in an accident which maimed his body beyond repair. A scientist found his body and moved Corben's brain onto a powerful robot body powered by kryptonite. The metallic body gives Corben superhuman strength, durability, speed and reflexes. He can also release the kryptonite energy that powers him into a beam and reconfigure his body into any shape he can think of.