A Subman.[1]

The Submen were a species of Earthlings that were closely related to humans, and they were the dominant species on Earth thousands of years ago.

Over time, they all became extinct and long forgotten, all but King Kull that is, who survived up into modern times because he was in suspended animation. Submen were many times stronger than humans, and King Kull was around the same strength as Captain Marvel.

References

  1. This image is artwork by Alex Toth that was drawn early in the development of the Challenge of the SuperFriends's Legion of Doom characters. The character of King Kull, who is pictured here, was never used, and by the time the show was fully developed, a number of other lineup changes were made in the Legion.
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