Mysteries of Unexplored Worlds #13

This is an anthology issue containing at least two stories. "What Was the Secret Power of the Green Star?" depicts a spaceship crew that encounters a crater-like orifice on an unexplored world and is cast out by a monster called Mercury; the crew escapes back to Earth with a sensational report of a huge living creature fixed in orbit. "The Meandering Man from Mars" follows a visitor from Mars who arrives on Earth and, after being mistaken for a vagrant, integrates into human society while attempting to understand Earth customs and takes a job at a strawberry shortcake stand; a young woman named Polly becomes involved in his adventures, including an encounter with barbells in a basement gym. The issue promises "Giant Jackpot Prizes" on its cover.