This issue is a reprint anthology. It includes the story “The Monster in the Iron Mask!” (originally from Tales of Suspense #31) in which an alien lands on Earth with the mission to soften the planet up for invasion. The alien is impervious to small arms fire, artillery, and even a direct hit from an atomic bomb — his only known vulnerability is to gas, which is hidden by an iron mask. A magician and his son deduce the alien’s weakness and persuade the army to use gas, forcing the alien to flee.
Also included is reprints such as “The Thing from the Hidden Swamp!” (from Tales to Astonish #30) and “The Thing in the Black Box!” (from Journey into Mystery #74).