I will say that Vinette Carroll has a very distinctive and creepy voice, almost masculine.  In addition to the voodoo lady, she plays (briefly) a stewardess on the airplane.  A lot of voice actors do these throwaway parts in radio dramas, but, in this case, her voice stands out so much, I thought maybe at the first that the stewardess and the voodoo lady were the same.  In any event, while not perhaps standing up to modern political correctness standards, this was quite an enjoyable action/adventure episode taking place on a presumably Caribbean island where the names are Hispanic but the language is French.  Zombies, voodoo.