Lieutenant Kuhnecke
Lucius Septimus
Paul Faber
Mr. Jackson
Delaney
The Prince of Wales
Paul's Father
Porpino
Edgar
(uncredited)
Bill Wainwright
Gus Loman
Von Koerner
Cyprus, the conductor
Van Dyne
Robert Duclos
Prof. Winkler
Von Alven
Owen Morgan-Vaughan
Hedges
Frank Mainwaring KC
Captain
Carter
Hausemann / Lord Buckley
Mr. Trout
Saville
Northern Salvage Company Manager
Captain Torres
Harris
Sir Charles Leigh
Inspector Forsythe
John Hobhouse
Cartwright
Lord Willie Panniford
German Secret Service Chief
Carr
Defense
Duke
Ship's Officer (uncredited)
Sir Reeves Willoughby
George the Third
Sir Frederick Bland
Schmidt
Sir Digby Montague
Aide
Court Chamberlain