H.B. Warner
— Prof. Dangerfield
Louise Fazenda
— Mrs. Fleming
Jacqueline Logan
— Irene
Henry B. Walthall
— Capt. Rhodes - Yacht Commander
Claude Gillingwater
— James Rutherford - Expedition Leader
John Miljan
— Dr. Milo
George Beranger
— Simpson - Guide
Warner Richmond
— First Mate
Floyd Shackelford
— Sam - Cook
Lionel Belmore
— Amos Sewald
Charles Gemora
— Gorilla (uncredited)