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Jim examines a quirky sci-fi/horror feature from 1957 -Charles Marquis Warren\'s "The Unknown Terror," starring John Howard, Mala Powers, May Wynn and Paul Richards. While searching for a woman\'s missing brother in a remote jungle area, three people find a mad scientist who is involved in human experimentation near the legendary entrance to Purgatory. Follow the expedition on this episode of "Monster Attack!"
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