Mysteries of Unexplored Worlds #11

This is an anthology issue containing at least two science fiction stories. The first story features a primitive man who discovers a mysterious long-armed creature and learns to fashion it into a tool by placing a stone in its loop, discovering its remarkable strength and throwing distance. The second story, titled "The Subject," involves a man named Gerard who is summoned to a mysterious gathering where a woman named Martha and others attempt to convince him he is a fake or imposter, while a sinister masked figure watches from the shadows. A third story depicts a boy who encounters a green-skinned alien being that has crash-landed near his home; the alien desperately needs water and fuel (radiator fluid) to repair its spacecraft before departing Earth.