 Fantasy illustrator and Movie Serial and Comic Book enthusiast,  Larry Ivy, believed that the original story for "The Return of  Captain America" may have been intended for a sequel to The  Copperhead from very fine 1941 serial "The Mysterious Doctor Satan".  The decision to use a script already on hand may have been made only  to bring the good Captain to the screen in a hurry. Consequently,  this Captain America did not have the trademark elements like the  shield, the war zone background or his sidekick, Bucky Barnes.