The Fixer
From superman.nu: Supermanica
The Fixer
A notorious outlaw who, in collusion with a renegade scientist, successfully manufactures a chunk of Synthetic Kryptonite and attempts to annihilate Superman in a kryptonite deathtrap, only to be apprehended by Superman (S No. 77/2, Jul/Aug 1952: "The Greatest Pitcher in the World!"). (TGSB)
