Metallo (Roger Corben)
From superman.nu: Supermanica
Metallo (Roger Corben)
Younger brother of John Corben, the first super-villain to use the name Metallo. Roger is transformed into the second Metallo by the criminal organization known as Skull in order to exact revenge on Superman for John's death. The Man of Steel is able to defeat Corben by stressing his artificial heart and closing the hatch that exposes the kryptonite in his torso (S No. 310, Apr 1977: "The Man with the Kryptonite Heart!").