Superworld Comics #3

Mitey Powers, Earth's ambassador to Mars, faces an impossible crisis when the giant race of Jupiter demands all radium supplies from both Mars and Earth—threatening the survival of both worlds. Assembling a small team including Nina and her father, Mitey attempts a dangerous diplomatic mission that ends in a harrowing attack, forcing him to devise a bold new plan with mysterious contents hidden in a secret chest. Now, disguised in special gear and traveling in an invisible ship, the trio lands on Jupiter itself to confront the thousand-foot-tall Jovians and their ruler Paahz.

In "null," Hip Knox is kidnapped by MacFadden and his gang, who strap him into a rocket plane and send it plunging toward the ocean—only for the craft to veer wildly over South America instead. Trapped and tumbling, Hip uses his mind to summon condors to slow the fall, then finds himself among hostile jungle savages, who, under his hypnotic influence, guide him to safety. From there, he returns to New York to face MacFadden and bring the villain to heel.

Detective Crane investigates mysterious explosions at West Virginia steel mills, only to discover they're actually sabotage strikes orchestrated by radio-controlled bomber planes. Tracing the signal to a secret base near Pittsburgh, Crane finds himself facing both mechanical robots and a foreign spy with designs to cripple America's industrial might. In "The Case of the Radio Spy!!" from Superworld Comics #3, the detective must outmaneuver his mechanical and human adversaries before the spy's next bombing run destroys everything—including the base itself.

When news breaks that a strange planet is approaching Earth's solar system, the brilliant young explorer Marvo seizes the chance to meet it first in his experimental ship—only to discover the approaching world, Antar, is piloted by intelligent antmen with a terrifying plan. Stranded on their planet and learning that the Antmen intend to crash Earth into the sun to claim its orbit, Marvo must use his wits and technical knowledge to sabotage their propulsion systems before the doomed world completes its fatal course toward home.