Metalloids
From superman.nu: Supermanica
Metalloids
Metalloids or metal men, are created with the help of a special “force-radiating instrument†capable of transforming human flesh into “invulnerable metal†(WF No. 143, Aug 1964: “The Feud Between Batman and Superman!â€; “The Manhunters from Earth!â€). Both Than-Ar and his evil brother Jhan-Ar transform themselves into Metalloids for very different reasons.