Mare Nostrum

The Triton (prologue) (as Uni Apollon)

Apollon Uni

Don Esteban Ferragut (prologue) (as Alex Nova)

Álex Nova

Don Esteban's Son - Ulysses (prologue)

Kada-Abd-el-Kader

Caragol (prologue)

Hughie Mack

Freya Talberg

Alice Terry

Ulysses Ferragut

Antonio Moreno

Ferragut's Wife - Dona Cinta (as Mle. Kithnou)

Mademoiselle Kithnou

Ferragut's Son - Esteban (as Michael Brantford)

Mickey Brantford

Ferragut's Niece - Pepita

Rosita Ramírez

Toni - the Mate (as Fredrick Mariotti)

Frédéric Mariotti

Doctor Fedelmann (as Mme. Paquerette)

Madame Pâquerette

Count Kaledine

Fernand Mailly

Submarine Commander (as André von Engelman)

Andrews Engelmann

Servant (uncredited)

John George