Hello, I'm an expert in comic book lore and superhero history. When discussing Superman's first villain, it's important to note that there have been different versions and interpretations over the years. However, in the original comic book appearances, Superman's first villain was a character named
The Ultra-Humanite.
The Ultra-Humanite made his first appearance in
Action Comics #2, which was published in April 1939, just a few months after Superman's debut in
Action Comics #1. The Ultra-Humanite is a disembodied, intelligent brain with superhuman mental powers, and he has been a recurring foe for Superman throughout the character's history.
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