A reporter and her fiance are conducting a search in the jungle for a wild boy, the lost son of a downed geologist.

The international criminal Vinaro enjoys sending explosive wristwatches to his enemies. Here he kidnaps ten-year-old Ramel whom he thinks can lead him to the lost city of gold. Tarzan fights the evil Mr. Train, six-foot-six bodyguard of Vinaro, and rescues Sophia, who has been left to die with an explosive around her neck. Various animals help Tarzan locate Vinaro's tanks and helicopters, the city and the boy

After an airplane crashes in the jungle, Tarzan rescues its five occupants who were en route to Europe via Cairo. The private plane was owned by Dick Penrod, an avid flyer whose hobby has created a rift between him and his wife Diana. After their rescue, they also encounter a professional hunter who offers to escort them to the coast. He has other plans for them however having already made a deal with a local tribal chief. In the end, it's left to Tarzan to rescue them all a second time.

After dispatching a ruthless hunter who traps animals for gain, he has to contend with his brother who is out for revenge.