During World War I, an illegitimate son of the German Kaiser, who had been raised in the US--and is a double for the Kaiser's son, the Crown Prince--is sent to Germany as a spy in order to kill both the Kaiser and his son.
| Actor | Role |
|---|---|
 Earl SchenckRobert Busch / Crown Prince | Robert Busch / Crown Prince |
 Claire WhitneyEmily Busch | Emily Busch |
| PPercy StandingRichard Busch | Richard Busch |
 Louis DeanThe Kaiser | The Kaiser |
| JJohn SunderlandLieutenant Patin | Lieutenant Patin |
| FFred HearnCarl Von Stumpf | Carl Von Stumpf |
| CCharles T. ParrLewis Keene | Lewis Keene |
| PPhilip Van LoanA Blue Devil | A Blue Devil |
| BBillie WagnerLittle French Girl | Little French Girl |
| VVictor De LinskyButler | Butler |