DC · May, 1957
Apr-May issue; Statement of Ownership, Management and Circulation for October 1, 1956
Secret of the Masked Martians!; The Greatest Thrill on Earth!; educ: Giants of the Telescope: Sir James Jeans; One-Way Ride to Eternity!; Wonders of Space (text); 21st Century Hercules!
Writers: Otto Binder, Edmond Hamilton
Artists: Sid Greene, Carmine Infantino, Gil Kane