Jonny and Hadji are marooned (by shipwreck) on the jungle coast of the African continent, where they are adopted by a tribe of friendly brown gorilla-like apes who protect them from a pair of Australian poachers, intent on kidnapping them for ransom. When the poachers managed to abduct Dr. Quest and Race, Jonny and Hadji must persuade to the apes to help rescue them and defeat the poachers.