"The Revolutionary V-3 Rocket"
Major Thorpe (writer and artist), Mort Leav (pencils and inks)
Published in Jumbo Comics #74, Apr 1945 - 6 pages
Photo Intelligence at G-2 studies a picture of a strange hole in a mountain. Why it exists in enemy territory is unknown but ZX-5 knows it cannot be any good for the Allies so he investigates.