A scientist who works in his home lab out of town is rejected by his colleagues at the Naturalists' Society when he presents his theory that the size of skull and brain equate with intelligence, and therefore Neanderthal man was equal, if not superior, to Homo sapiens. After his professional rejection, the scientist is rejected by his fiancee and becomes mad with desire and rage. He secludes himself in his lab, where he develops a serum that turns himself into The Neanderthal Man. Rumors of saber-toothed tigers roaming the countryside and several assaults on local men bring out the local Sheriff, who attempts to solve this new mystery, which is clearly connected to the scientist's experiments.

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Us release date: June 19, 1953