Hughie Mack

Caragol (prologue)

Alice Terry

Freya Talberg

Antonio Moreno

Ulysses Ferragut

Frédéric Mariotti

Toni - the Mate (as Fredrick Mariotti)

Madame Pâquerette

Doctor Fedelmann (as Mme. Paquerette)

Fernand Mailly

Count Kaledine

Andrews Engelmann

Submarine Commander (as André von Engelman)

John George

Servant (uncredited)