Wallace Reid
— Prince Karl Heinrich
Dorothy Gish
— Katie Ruder
Karl Formes
— Dr. Juttner
Erich von Stroheim
— Lutz
Raymond Wells
— Karl Bilz
John McDermott
— Von Wendell
James Gibson
— Kellerman
Franklin Arbuckle
— Fritz Ruder - Katie's Father
Madge Hunt
— Frau Hans Ruder - Katie's Aunt
Erich von Ritzau
— Prince Rudolf (as Erik von Ritzau)
Kate Toncray
— Frau Fritz Ruder - Katie's Mother
Harold Goodwin
— Prince Karl - Age 12
Francis Carpenter
— Prince Karl - Age 5