Clyde Beatty, the world's greatest animal trainer, travels the jungles of the world in search of exotic beasts and adventure. Beatty's expeditionary dirigible crashes on a remote unexplored island teeming with wild animals. He discovers that two fanatic cultists on the island have killed the skipper of their group and stolen the priceless treasure of Kamor. Ruth Henderson (Cecelia Parker) enlists Beatty to help find her scientist father who has dissapeared in the wilderness and while pursuing the treasure. The Lost Jungle is filled with cliffhanging action and features Clyde Beatty's death defying acts of bravery which include realistic hand-to-hand battles with lions, tigers and gorillas.