Planet Comics #7

In "The Rockmen of Jupiter," the crew of the spaceship Discoverer stumbles into a cosmic anomaly when Earth suddenly appears in their path—far too close and impossibly misplaced, given their location near the asteroid Medona. As they grapple with the impossible, they soon realize they've been flung back in time to the era of the Roman Empire, where the mysteries of space and history collide in ways no one aboard could have predicted. Written by Lin Davies and illustrated by Witmer Williams, with a striking cover by Bob Powell, this 1940 adventure blends early science fiction wonder with a touch of ancient intrigue.