(All American Comics 011 & 013, 1940)
What makes them a super-villain? He's a guy who kind of looks like Satan (named I.M. Glib, natch) who uses such as invisibility fields and food spoiling chemicals to ransom cities and US Senators. A slam dunk, definitional villain.
What about them is interesting? He's a Golden Age scientific villain who made two appearances and used the same technology in both of them. This is almost unprecedented, I assure you - ordinarily someone who made their first foray into crime with invisibility tech would be sporting a time machine or an army of robots in their second.
