A plane flying to Cape Town, carrying a young couple and their baby, crashes in the jungle. Everyone on the plane dies, except for the baby who is rescued by Cheeta, Tarzan's chimpanzee. Tarzan and Jane adopt the child and name him "Boy." Five years later, a search party comes looking for Boy, because he is the heir to the Greystoke family fortune worth millions. The search party is led by the Lancing family, who are distant cousins of Greystoke. Tarzan and Jane claim the child is dead and that Boy is theirs, but the elder Lancing, Sir Thomas, recognizes Boy's eyes. The younger Lancings suggest leaving Boy and taking the inheritance. When Sir Thomas objects, they say they will take him back and, as legal guardians, still control the inheritance. Sir Thomas says he'll tell Tarzan, but the rest of the party imprison Sir Thomas in a tent and plan to abduct Boy. Tarzan overhears them plotting; he steals their guns and throws them into a deep lake. Jane arrives the next day and learns what has taken place, and admits that Boy is Greystoke. She persuades Tarzan to retrieve the cache of guns, without which the search party can't survive. Tarzan retrieves them but Jane drops the rope so that Tarzan is trapped. Jane convinced it's 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 a 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 three-year gap between this and the previous Tarzan film was because MGM had originally let the film rights elapse after Tarzan Escapes.Independent producerSol Lesser obtained the rights to make five Tarzan movies, but the first of these, Tarzan's 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. MGM realized that Weissmuller had continuing attraction as Tarzan and bought out Lesser's interest in the next three films; they restarted their series. This film was originally to be called Tarzan in Exile. As it featured the jungle couple acquiring an infant, it was changed to Tarzan Finds a Son. The plot device was to appease morality groups, as Tarzan and Jane were married in the films. This was intended as Maureen O'Sullivan's last appearance as Jane in the series, with her character to die as a result of a spear wound. O'Sullivan was tired of the Jane role, and Boy was brought in as a substitute interest. After audience previews showed very negative reactions to her death, the ending was changed. Johnny Sheffield, who played Boy, claims that Weissmuller handpicked him for the part and taught him to swim. Since Tarzan and Jane had no son in 1936 and since the bulk of this plot occurs five years after Boy is found, the date for this film is 1941. A date conflict with incidents in subsequent films that occurred during World War II. Boy in this film was the heir to the Greystoke fortune. In the original Burroughs books, Tarzan was Lord Greystoke. Original prints of Tarzan Finds a Son! were processed in sepiatone.
Reception
According to MGM records the film earned $1,039,000 in the US and Canada and $1,049,000 elsewhere, resulting in a profit of $528,000.
