The Son of Tarzan (1920)

Back cover to TARZAN MY JUNGLE KING sheet music. Announcing the world's wonder jungle serial 15 EPISODES OF Jungles, Wild Animals, Thrilling Action, Love and Romance. THE STORY of a boy and girl growing to manhood and womanhood and Love in the heart of the African Jungle fighting for life and happiness. The most absorbing Love Story ever told.---
Plot as told by WIKIPEDIA: Tarzan and Jane have left Africa, married and settled in London. Their pre-teen son, Jack, dreams of jungle adventures like his father's, but is discouraged by his parents. He sneaks away to see a trained ape called Ajax (in reality, Akut, an old friend from Tarzan's youth). The ape's trainer is really Ivan Paulovich, an old enemy of Tarzan's, who is looking for a way to enact vengeance. He kidnaps Jack and takes him to Africa.

Jack escapes with Akut and survives on his own in the wild much like his father did before him. He is given the Ape name Korak, which means "Killer" in their language. Korak rescues Meriem, a young French girl held captive by Arab slave traders and they grow to adulthood in the jungle. Paulovich hopes to receive a ransom from her wealthy parents for her return as well and attempts to capture both of them.

Eventually Paulovich lures Jane to Africa in order to extort a ransom, but Tarzan soon follows. Tarzan and Jane, living at their African estate, find Meriem and informally adopt her. They discover her parentage and send for her father. The film climaxes with a battle pitting Korak against Paulovich, his henchmen and the slave traders. An elephant rescues Korak, who is bound to a stake and he and Meriem are reunited with their parents, and all sail for England.