Stories by Klaus Nordling and Bert Whitman. Art by Walter Frehm, Sid Greene and Ray Willner. Cover by Harry Fisk. Vita-rays transform Michael Shelby into the hero known as the Green Mask. The Green Mask and Domino face a trap set by spies Dr. Tsu and the beautiful Lo Lan; Nazi fifth columnists plot to destroy an airplane factory; Two-fisted sailor Spark Stevens faces a foreign agent with the unlikely name Madam Kakymamie (cockamamie, a 1940s slang term). Duel To the Death With Dr. Tsu; Kurt Ebler's Spy Gang; Stolen Submarine; Lana Gebb, Nazi Spy; Spark Stevens: The Menace of Madam Kakymamie; Chen Chang: The Gun-Runner; Navy Jones: The Pirate Submarine Fleet.