Tarzan Finds a Son is a 1939 Tarzan film based on the character created by Edgar Rice Burroughs. It was the fourth in the MGM Tarzan series to feature Johnny Weissmuller as the King of the Apes.
Jane, convinced its the right thing to do, goes with Boy and the rest of the Lancings toward civilization but Sir Thomas convinces her that the younger Lancings only want Boy for his money. Sir Thomas tries to sneak away but they shoot him. Thinking Jane is trying to fool them, they ignore her directions and fall into the hands of the Zambeli, known for mutilation of captives. The white people are held in a separate hut while the tribe begins to kill and preserve the native bearers. Jane is wounded while helping Boy to escape through the fence. Boy finds Tarzan and is aided by chimps and elephants to free him. Tarzan reaches the Zambeli village and uses the elephants to drive away the natives. He saves two of the search party, and he and Jane decide to keep Boy with them in the jungle.The threeyear gap between this and the previous Tarzan film was because MGM had originally let the film rights elapse after Tarzan Escapes. Independent producer Sol Lesser obtained the rights to make five Tarzan movies, but the first of these, Tarzans Revenge, proved to be a flop. The producers believed that audiences were unwilling to accept Glenn Morris in the role made famous by Johnny Weissmuller. Lesser had been unable to obtain Weissmullers services as he remained under contract at MGM. MGM realized that Weissmuller had continuing attraction as Tarzan and bought out Lessers interest in the next three films they restarted their series. ........
Source: Wikipedia