Chemo
From superman.nu: Supermanica
Chemo
A gigantic receptacle of aborted chemical experiments created by crazed scientist Ramsey Norton (first appearance, Showcase No. 39, Jul/Aug 1962: "The Deathless Doom!"), Chemo takes on a destructive and villainous nature of its own. Stalking the Earth, destroyed and re-born numerous times, Chemo is originally an enemy of the Metal Men but also battles Superman (for example, S No. 342, Dec 1979: "Hero Under Glass!" and S No. 370, Apr 1982: "Better Vengeance Through Chemo-stry!").
