"The Impervious Pill Box"
Major Thorpe (writer and artist), Mort Leav (pencils and inks)
Published in Jumbo Comics #64, Jun 1944 - 7 pages
ZX-5 is determined to learn of the new invention by German weapons master Karl Brueller have come up with to defy the expected D-Day invasion. He starts out by being shot out of a torpedo tube from a submerged submarine.