Other Versions

Firestorm has appeared in various alternate realities within the DC Multiverse: a gender-reversed version appears in Countdown: The Search for Ray Palmer as an inhabitant ofEarth-11; a version of the Ronnie Reymond Firestorm appeared in JLA: The Nail, as a captive of Cadmus Labs; a Firestork in Just'a Lotta Animals; a Firestorm of a Justice League 100 years in the future, where Maxwell Lord has plunged humanity into a massive Metahuman war appeared in Justice League: Generation Lost; and a merger of Ronnie Raymond and Nathaniel Adam of Earth-37 called Quantum-Storm was summoned by Monarch in the mini-series Countdown: Arena.

Earth-3
During the "Trinity War" event, Firestorm's Crime Syndicate counterpart is introduced as Deathstorm from Earth-3. It is revealed that on Earth-3, Professor Martin Stein would experiment on humans to unlock the secret of life through death. He was recruited by one of the Crime Syndicate's enemy's to determine what the Syndicate's individual weaknesses were. However, he used the new lab he was in to continue his human experimentation, eventually experimenting on himself, fusing with a corpse, becoming Deathstorm. He is killed by Mazahs who then steals his powers.