Heinrich Melch was a soldier in Nazi Germany whose father was charged with developing a plan to stop Superman. Melch was dosed with a special chemical developed by his father using Green Kryptonite in order to transform his son into a super soldier. The experiment succeeded and Melch started his plan to kill Superman.
Melch's first attempt failed and he was presumed dead. Many years later, he was transported to Earth-One, where he gained more superpowers and, under the alias of Atoman, he attempted to eliminate the Earth-One Superman. Melch was stopped by the combined work of Earth-One's Superman and Batman, who transported him back to Earth-Two, where he lost his powers and he was captured by the Superman and Robin of Earth-Two.
- Atoman is based on a character from the Superman radio show from the 40s, who appeared in the same storyline where Superman and Batman first met.
- This version of Atoman, including all history and corresponding appearances, was initially erased from existence following the collapse of the original Multiverse in the 1985–86 Crisis on Infinite Earths limited series. However the ending of Convergence retroactively prevented that collapse, saving all the alternate realities, though in an "evolved" form. Even though versions of the character may have since appeared, this information does not apply to those versions.
- When Superman of Earth-One created the Powerman robot, he based its costume on Atoman, whom he had subconsciously seen thanks to extra-dimensional interference as Melch recovered from his near death battle with the Earth-Two Superman during World War II.
- 1 Appearances of Heinrich Melch (Earth-Two)
- 1 Images featuring Heinrich Melch (Earth-Two)
- Quotations by or about Heinrich Melch (Earth-Two)
- Character Gallery: Heinrich Melch (Earth-Two)
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