Four British villains raid a settlement to obtain explosives for use in a diamond mine. In doing so they nearly destroy the settlement, so and Tarzan pursues them to their mine.

After diamond hunters kill two people while stealing explosives, Tarzan sets off after them. The group, led by a man named Slade, are off to excavate a diamond mine. Along the way, Tarzan rescue an attractive woman, Angie, whose crashes her small airplane. She finds the trek demanding but sticks with it proving her worth when the time comes. As for Slade and his group, greed and jealousy take hold leaving only a few of them for Tarzan to fight in the end.—garykmcd

Led by vicious Slade, his gang of thieves--O'Bannion, Dino, Kruger, and Slade's Italian girlfriend, Toni--raid defenceless villages along the serpentine river within mighty Tarzan's territory. As they work their way upriver, plundering weapons, supplies, and explosives, two men die, and Tarzan, along with downed pilot Angie Loring, embarks on a mission to stop them before they reach a hidden diamond mine that only Quayle knows its exact location. Without a doubt, greed, and the fever of gold, can turn a person mad, and, even though the unforgiving jungle is rife with formidable adversaries, Slade and his jackals are bent on finding the mine at all costs. Can Tarzan's arrows stop the gun-totting invaders?—Nick Riganas