Tarzan encounters Nara, a beautiful young blind girl (Laurie Sibbald) who lives by herself in a cave since her parents were killed years before in a riverboat accident. The girl uses Sultan, a full-grown lion, as a seeing-eye animal. But there is another lion in the area who resembles Sultan who is a dangerous killer, and whom the local natives want to destroy. Tarzan must rescue Sultan from being slaughtered by mistake while finding a way to get Nara to want to return to human companionship.
Tarzan's friend, policeman Khobi is close to death after being severely wounded by diamond smuggler Spooner. Tarzan intends to bring the criminal to justice as Spooner's gang tracks them through the jungle to free him.
When the chief of a tribe, a friend of Tarzan's dies, his daughter prepares to succeed him, a member of the tribe, opposes her being the tribe's new chief. So he asks that the old test, The Three Faces of Death be imposed to prove her worthy. But unfortunately a woman can't face a man in test, so another member of the tribe must face him in her place. When no one accepts, Tarzan steps in. And if her fails not only will she not be chief, she'll be killed.
An evil colonel arrives in Tarzan's jungle, determined to carve out his own empire. He enslaves the Singa people and deposes the old chief. Tarzan urges the new leader Metusa to fight the Colonel who has brought in Sgt Marshak to kill Tarzan.
Tarzan continues his cat and mouse game with the colonel who with Sgt Marshak trails the apeman into the jungle. Quicksand and lions take their toil but it's an act of bravery that allows Tarzan to prevail.
Tarzan and Jai meet young Prince Sharif plus his bodyguard Karim. The boys are the same age which complicates criminal Grundy who's intent on kidnapping the prince before he's crowned. He intends to get rid of Tarzan as well.
Jai is scratched by an infected jaguar becoming sick but Dr. Haru has developed an antidote. Bwanichi, a tribal medicine man, doesn't trust the new ways and steals it. Tarzan must battle a giant clam plus a fire to help Jai.
After their chief is injured the Matusas ask Tarzan to be their representative in an athletic endeavor against another tribe. The priceless Golden Lion is the prize but Karl and Wilhelm steal it when everyone else is busy competing.
Tarzan and Jai visit his island friends the Tanga, who depend on fishing the ocean for their peaceful way of life. Admiral Gioco threatens it when his quest for pearls deplinishes the seas. He chains Tarzan in a cave to achieve his goals.
Tarzan rescues Suzanne from a plane deep in the jungle needing medical care. Sean and Tyler are handcuffed, both deny they are the prisoner were also in crash. Tarzan must reach civilization while evading homicidal Damian.
Tarzan is captured by crazed scientist Ivor Merrick who pits a computer against the Apeman's life. Tarzan must escape the preserve to save his life but the odds are against him. Dr. B'Dula attempts to aid Tarzan in the conflict.
Tarzan and Jai meet Dr. Gloria Halverson who is studying volcanic activity. It erupts, bringing enemy tribes, the Karish and Crater people, in proximity. Jai is protected by Chief Hamaar but need Tarzan's help in escaping a fiery cave.