A wealthy industrialist hires the renowned hoax-buster Phillip Knight to prove that an island he plans to develop isn't voodoo cursed. However, arriving on the island, Knight soon realizes that voodoo does exist when he discovers man-eating plants and a tribe of natives with bizarre powers.
| Actor | Role |
|---|---|
 Boris KarloffPhillip Knight | Phillip Knight |
 Beverly TylerSarah Adams | Sarah Adams |
 Murvyn VyeBarney Finch | Barney Finch |
 Elisha Cook Jr.Martin Schuyler | Martin Schuyler |
 Rhodes ReasonMatthew Gunn | Matthew Gunn |
 Jean EngstromClaire Winter | Claire Winter |
 Friedrich von LedeburNative Chief | Native Chief |
| GGlenn DixonMitchell | Mitchell |
| OOwen CunninghamHoward Carlton | Howard Carlton |
| HHerbert PattersonDr. Wilding | Dr. Wilding |
| JJerry FrankVickers | Vickers |
 Adam WestWeather Station #4 Radio Operator | Weather Station #4 Radio Operator |