Miner Guy Masters was trapped in a cave-in who was mutated by a mysterious green gas into a rage-filled monster that could take on the properties of anything he touched. A second exposure to the gas orchestrated by the Blackhawk Squadron reverted him back.
- This version of Guy Masters (Earth-One), including all history and corresponding appearances, was erased from existence following the collapse of the original Multiverse in the 1985–86 Crisis on Infinite Earths limited series. Even though versions of the character may have since appeared, this information does not apply to those versions.
- 1 Appearances of Guy Masters (Earth-One)
- 1 Images featuring Guy Masters (Earth-One)
- Quotations by or about Guy Masters (Earth-One)
- Character Gallery: Guy Masters (Earth-One)