John Loder
— Capt. Rufus Grant
Noel Madison
— Dr. Klee
Belle Chrystall
— Nora Grayson
Leonora Corbett
— Herlaine Frank
Jerry Verno
— Hugo Guppy
Davina Whitehouse
— Polly
Eliot Makeham
— Professor Grayson
Alexander Sarner
— Mr. Vander
Melville Crawford
— Pete Voss
Nigel Barrie
— Colonel Lockwood
Carl Melene
— Monsieur Buckner