While Professor Porter tries to fit in with the gorilla troop in order to study them, Tarzan and Jane look into a new trading post established by a French trader named Renard Dumont. After a brief scuffle with his men, Tarzan decides to allow them to stay as long as they don't interfere with the gorillas. After Jane does some shopping, Terk and Tantor realize that the trading post was constructed on the old Watering Hole of the local Rhino herd and wonders where they went. The rhinos are now rampaging through the jungle and are heading towards the gorilla nests and Tarzan must find a new place for the rhinos or be forced to move the gorilla troop elsewhere. After an attempt to reason with the rhinos fails, Tarzan ends up turning to Dumont's trading post and gets some dynamite which he uses to redirect a stream and create a new watering hole for the rhinos.
- This would be one of the episodes to appear in a flashback in the episode Tarzan and the Mysterious Visitor with Dumont telling the story where he has become impressed with Tarzan's ingenuity.
- Professor Porter loses his loincloth twice in this episode.