The originalheld the mantle from 1940
Rex Tyler
Powers. : sometimes Rex could reinforce residues of the Miraclo pill contained in his body and access its effects, once by using a black light, other time by reciting the mantra "Man of the Hour". ; Enhanced Immune System: the effects evidently persist even after Miraclo wears off.
Origin
Rex Tyler, a brilliant chemist, discovered a remarkable compound he called Miraclo — a pill that granted him superhuman strength, speed, and stamina for exactly one hour. Donning a colorful costume, he became Hourman, one of DC's earliest mystery men and a founding member of the Justice Society of America.