Sixteen year old Robbins Barstow, an Amateur Cinema League member and a fan of Johnny Weissmuller's Tarzan movies, rounded up his siblings and friends and led them into the wilds of Granby, Connecticut for this epic tale of a journey into Edgar Rice Burroughs' Africa.
James Parker and Harry Holt are on an expedition in Africa in search of the elephant burial grounds that will provide enough ivory to make them rich. Parker's beautiful daughter Jane arrives unexpectedly to join them. Jane is terrified when Tarzan and his ape friends abduct her, but when she returns to her father's expedition she has second thoughts about leaving Tarzan.
A group of archaeologists asks Tarzan to help them find an ancient city in a hidden valley of women. He refuses, but Boy is tricked into doing the job. The queen of the women asks Tarzan to help them.
Hoping to save his sick mother, a boy named Gunner and his friend Jo venture into the remote Wild Horse forest to search for a mythical figure who possesses the secret to immortality. When they go missing, Gunner's father Amos must immerse himself in his son's world to find them.