Ziff-Davis · May, 1939
Vol. 1 #1
Revolt of the Robots; The Invisible Robinhood; The Empress of Mars; The Sleeping Goddess; Adventure in Lemuria; The Mummy of Red-Seh; The Devil Flower
Writers: Eando Binder, Arthur Tofte, A. Hyatt Verrill, Frederic Arnold Kummer Jr, Ross Rocklynne, Maurice Duclos, Harl Vincent
Artist: Julian Krupa