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See also Captain Atom for a complete list of references to clarify differences between these closely named or closely related articles.

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Earth-4's Nathaniel Adam was an inhabitant of one of the many divergent realities that came about after the restructuring of the Multiverse during the 52 event. A native of Earth-4, he appears to share many similar qualities with his Pre-Crisis Earth-Four counterpart, Allen Adam.

Captain Atom was one of the Captain Atoms recruited to the Captain Atom Brigade to battle Monarch.[1] However, the Brigade was destroyed and defeated, and Monarch deliberately left Captain Atom as the last one alive due to their perceived similarities. Monarch confronted his counterpart to see if he possessed any of his own maniacal traits, only to have Atom rebut "burn in hell, you monster" before being killed.[2]