Composition based on the painted cover to the pulp magazine G-8 and His Battle Aces [Vol. 20 No. 4, May 1940] (Popular Publications, Inc., 10¢, 112pp+, pulp, cover by Frederick Blakeslee)
Plot based on the 63-page novella "The Green Scourge of the Sky Raiders" by Robert J. Hogan, published in the pulp magazine G-8 and His Battle Aces [Vol. 20 No. 4, May 1940] (Popular Publications, Inc., 10¢, 112pp+)
Based on Henry Steeger's creation for The Spider magazine.