Bill Everett started in comic books with “Skyrocket” Steele, a Buck Rogers / Flash Gordon clone in Centaur Publications’ Amazing Mystery Comics Funnies #2 (August 1938). Everett would later go on to create Namor, the Sub-Mariner for Marvel / Timely Comics.
One correction. The actual name of the comic in which “Skyrocket” Steele appeared was Amazing Mystery Funnies.
Thanks Carl – corrected!