Stark Mad

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)