Part 3 of our Not-So-Super Posts: Captain Marvel. (Fun Fact: Nearly all of these come from the Adventures of Captain Marvel serial, which is so old it actually has his name in it!)
Dr. Stephen Lang
Professor Luther Bentley
Betty Wallace is a member of the Malcolm Expedition in The Adventures of Captain Marvel serial (March 1941) and appears in an adaptation of the first chapter of said serial in Captain Marvel Adventures #2 (Summer 1941).
The Scorpion Machine