While performing experiments for the US government, he was accidentally exposed to a mysterious black ray infused with the blood of an eagle.
[3] He was accompanied by his young companion Bud Pierce who, as "Eaglet", had powers similar to the American Eagle.
Moore used the Nedor Comics characters to populate Terra Obscura, the alternate universe version of Tom Strong's Earth.
Issue #4 reveals that the American Eagle and Eaglet had been looking for the missing Captain Future, and had traced him to the lair of Dr. X.
In the struggle that followed the American Eagle and Eaglet were both killed; their bodies were discovered three years later by the Scarab and the Liberator.