A local postman is attacked and stabbed by two men hoping to intercept a map to an unclaimed diamond mine being sent to a man and his daughter. Learning of the circumstances from the dying mailman, Ramar sets out to stop the two men from stealing the mine from its rightful owners, and most likely killing them while they're at it.
An American explorer has stolen sacred idols from the Ngoma village, which the villagers believed protected them from illness and evil spirits. When the natives began to come down with mysterious ailments, the chief decides to execute one white man for every villager who dies. Dr. Reynolds must find the fleeing explorer and get the idols back before anyone else dies.
Tom and Howard come across a savage tribe that worships a breed of monkeys that they say lives longer than human beings do. Wanting to investigate this further, the pair seek out the tribe's camp to try to capture one of these mysterious monkeys.
Ogden and Reynolds come upon a local funeral, and are shocked to see that the "dead" man on the funeral pyre is very much alive. The natives believe that they have just seen the "walking dead", but Reynolds and Ogden think otherwise.
After an American explorer removes the the sacred "Urn of Destiny" from the Tomb of Akara, he is suddenly seized by murderous rages, but then has no recollection of anything that he has done. Baffled, Dr. Reynolds consults with a local doctor, who tells him that the explorer's condition is brought on by the urn itself, which is cursed.
The brutal Crocodile cult of Kaa is kidnapping villagers and threatening to sacrifice them if a ransom is not paid. The cultists have superhuman strength, and Dr. Reynolds sets out to discover the source of their power, destroy the cult and rescue the villagers.
A plantation owner is killed in an apparent tiger attack, but Reynolds and Prof. Ogden don't believe it was a tiger. They set out to determine who the real killer is before they themselves become the next victims.
While traveling through the jungle in search of the Forbidden Village, Ogden and Reynolds come upon an American photographer who has just been chased from the village. The villagers believe that the photographer's presence has caused an outbreak of plague, and are threatening to kill anyone who comes to the village. Reynolds knows that he must enter the village to try to save the plague victims, even under the penalty of death.
Wild animal hunter Jack O'Malley arrives in the area searching for two tigers that have escaped while being transported to India. The beasts are attacking and killing the natives, and the locals have come to believe that the animals are being controlled by Ramar's "black magic".