Joseph Martin was a researcher who discovered his wife's affair, killing her. After gaining his radiation powers after the cruise liner he was on crashed, Martin lived on an island. His powers eventually overloaded, leaving him with a skull for a face and trapped on a barren island. Eventually, the Skull was recovered and placed in the Kamen Maximum Security Prison. From he here was transferred to a government laboratory and placed in stasis alongside John Corben. When Superman transformed into Superdoom, the Skull was sent out with Corben to try and kill him with an areosol clout of Kryptonite. While Steel incapacitated the Skull, the Kryptonite was still released.