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The Unknown Terror
- Año: 1957
- País: United States of America
- Género: Terror
- Estudio: Emirau Productions, Regal Films
- Palabra clave: amazon rainforest, mad scientist, missing person, underground cavern, man with limp, fungus people, primitive village
- Director: Charles Marquis Warren
- Emitir: John Howard, Mala Powers, Paul Richards, May Wynn, Gerald Milton, Duane Grey