Gregori Arcane

 is a fictional mutated experiment featured in comic books published by DC Comics. He is considered part of DC's Pre-Crisis Earth-One continuity, though his existence and background have been preserved in the rebooted internal reality which existed following the 1985-86 maxi-series Crisis on Infinite Earths. The character first appeared in Swamp Thing, Volume 1 #2 in January, 1973.