Nat Tryon
From superman.nu: Supermanica
A small-time criminal who was frequently employed by Lex Luthor as a henchman. Nat (short for "Nathaniel") Tryon frequently worked with fellow hoods Ted Grand and Tim Moore as the TNT Trio until Tryon's transformation into the villain called Neutron (ACT No. 525/1, Nov. 1981: "Neutron Nightmare!").
