Ramar hears about a rare substance that halts the effects of aging. The only problem is that it is in territory controlled by The White Goddess, where white men are forbidden to enter. Nevertheless, Ramar is determined to make contact with her, but discovers that he's not the only one--two dangerous escaped convicts are looking for her, too.

A safari ends disastrously when all the native guides and their leader are mysteriously murdered. The only survivor is the leader's wife, and the superstitious natives believe she is a witch who caused the disaster, and demand her death. Dr. Reynolds protects her while trying to find out what really happened on the safari.

Ramar and Prof. Ogden come across two botanists who have just, they claim, killed their native guide in self-defense. Believing their story, the men are offered lodging for the night at Ramar's camp. However, what Ramar and Ogden don't know is that the men aren't really botanists but narcotics traffickers in Africa looking for new supplies, and they are taking a great interest in Ramar's and Ogden's new--and unpatented--medicines.

While researching a medical project. Dr. Reynolds and Prof. Ogden learn of an area ruled by a woman called The White Goddess, who uses a witch doctor's secret formula to remain young and rule over the local tribesmen.

A small plane crashes in an area ruled by a tribe of murderous cannibals. Ramar sets out to rescue the survivors before they become they become the main entrée on the cannibals' dinner menu.

Prof. Ogden is attacked by a member of the sinister Shaitan devil-worshiping cult, and when he awakes he has the mark of Shaitan burned into his hand. The legend is that when the mark disappears the person will die, and as the symbol begins to fade away, Ogden gets sicker and sicker. Dr. Reynolds must race against time to unlock the secrets of the Shaitan cult before Ogden dies.

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 trader can't convince the chief of a native tribe to exchange their ivory for gold. However, the village's corrupt witch doctor is more than happy to make the trade and, unknown to the chief, strikes a deal with the trader to steal the tribe's ivory in exchange for the gold. To cover his tracks, though, the witch doctor frames another tribesman for the crime--the chief's son, who happens to be a friend of Ramar's.

Dr. Reynold and Prof. Ogden are suddenly attacked by a tribe whose members are wearing a distinctive blue face paint, something neither of the men has ever seen before. The attackers are driven off, but Reynolds and Ogden manage to wound and capture one of the warriors. While the native recovers from his injuries, Tom, Howard and Charlie set out to discover what caused the unprovoked attack, and find out the meaning of the mysterious blue face paint.

Chief Matumbo sends for Dr. Reynolds to try to help an explorer who is dying from a mysterious illness. When the doctor arrives at the village, however, the natives try to kill him. It turns out that the dying man is holding a secret that someone is trying to make him tell using voodoo, and Reynolds must find out what that secret is in order to discover who is using the voodoo on him.

Ramar, Howard and Nancy Arlington find her father alive, but in the hands of the greedy Dexter, who believes that the inscription on a golden tablet he discovered is the key to a treasure of unimaginable wealth, and he will stop at nothing--including murder--to get the tablet translated.

Dr. Reynolds treats a man whose wife has just died in an accident. When the natives begin hearing voices coming out of the darkness and see what they believe to be ghosts, they fear that the man's dead wife has come back to take vengeance for her death.

Dr. Reynolds finds a woman dressed only in leopard skins who is held captive by her husband. The husband explains that during a full moon, the woman turns into a man-eating leopard. A suspicious Reynolds determines to find out the truth of the man's claims.

A friend of Zahir is kidnapped by members of the Shanda cult, who intend to make her the bride of their murderous god. Reynolds and Prof. Ogden set out to rescue the girl from a fate worse than death.

Two poachers plan to attack and rob a convoy of natives who are bringing ivory tusks to a nearby trading post.

Jeff Sharpe, an old college friend of Dr. Reynolds, arrives in Africa in search of a rumored vast uranium deposit. Reynolds warns him that another scientist who had come seeking out the same deposit has vanished into thin air.

While archaeologists are attempting to recover a golden tablet, they are captured by natives, who accuse them of breaking a sacred taboo. Reynolds and Ogden must find them and rescue them before their captors administer their own version of a "truth serum".

A mad scientist turns Prof. Ogden into a murderous zombie, and sends him on a mission to murder Dr. Reynolds.

A beautiful but evil scientist plans to test her latest discovery, atomic gas, on the local natives. Dr. Reynolds finds out about her despicable scheme and sets out to stop her.

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.

Trudy Van Dyne has been kidnapped by a wandering tribe, and her father asks Dr. Reynolds and Dr. Ogden to help find her. They eventually trace her to a village, but discover that the local witch doctor has placed her under a black magic spell.

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.

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.

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.

A doctor's houseboy is murdered, and all the clues lead to a missing talisman and the mysterious Kaali cult.