America's Greatest Comics #6

When Billy Batson's radio station receives a desperate plea from the daughter of a missing explorer, the young reporter sets sail into the uncharted waters of the South Atlantic to find him—only to discover that the legends surrounding the lost expedition are all too real. As Billy and his companion Steamboat navigate treacherous magnetic forces, mysterious islands, and hostile natives, Billy must transform into Captain Marvel to survive the perils of Jingle Jangle Jungle and uncover what happened to Professor Meade. Written and illustrated by the creative team behind America's Greatest Comics, this 1943 adventure pits the World's Mightiest Mortal against mysteries that have claimed explorers for centuries.

When Nazi saboteurs smuggle themselves across the Canadian border in a hay wagon, Spy Smasher [Alan Armstrong] uncovers a sinister plot to destroy the Niagara Falls Power Plant—a vital hub feeding electricity to America's war industries. But the scheme runs deeper than simple sabotage: the spies are orchestrating a massive blackout timed to the execution of the ruthless Baron Von Stuka, and Spy Smasher finds himself caught between stopping the sabotage and preventing the arch-villain's escape. As the power plant falls under enemy control and the stakes climb toward their climax at the Falls themselves, the hero faces his most dangerous confrontation yet against the one foe he swore he'd never let slip away.

When retired crime boss John "The Bookmaker" Bugg grows bored with civilian life, he cooks up a sinister new scheme: opening an underground betting parlor called the Crime Derby, where gamblers wager on the outcomes of real crimes versus law enforcement—with Mr. Scarlet and Pinky's heroics posing a threat to his odds. After losing big on his bets against the red-robed crime-fighter, the Bookmaker devises a desperate plan to eliminate his most costly rival and rig the races in his favor. Mr. Scarlet and Pinky must uncover the scheme and shut down the operation before the Bookmaker's criminal enterprise corrupts the entire city.

When three Nazi officers dismiss a dying witch doctor's curse as superstition, Commando Yank is dispatched to investigate the silent Jabuta garrison deep in the African interior. Racing against time to uncover what's happened, he discovers the Nazis are hunting for the legendary Great Crown—and their quest has awakened something far older and darker than any military threat.

Minute Man is called to Singer City where the war bond drive has mysteriously collapsed and citizens have grown strangely seditious—all while military secrets leak from local plants. When the hero arrives to investigate, he discovers that an Axis agent named Herr Henkle and a stolen hypnotic drug are behind the town's peculiar behavior, and he must uncover the full extent of the conspiracy before it can be turned against him.

When Blackie Bane and his mob hijack a truck carrying Professor Eden's mysterious discovery from South America, they unleash something far more dangerous than the treasure they bargained for—ancient monsters that grow to enormous proportions once removed from their hidden valley. Bulletman and Bulletgirl must track down both the prehistoric creatures and the criminals before the beasts cause catastrophic destruction across the city. Written by the Creators of "The Flying Detective," this 16-page adventure pits science against crime in a wild race against time.