Don Carlos, heir to the Spanish throne, and Princess Elisabeth of Valois are deeply in love but King Philip, Carlos's father, wants Elisabeth for himself.
| Actor | Role |
|---|---|
 Conrad VeidtDon Carlos | Don Carlos |
 Dagny ServaesElisabeth von Valois | Elisabeth von Valois |
 Aud Egede-NissenPrincess Eboli | Princess Eboli |
 Eugen KlöpferDon Philipp | Don Philipp |
 William DieterleMarquis Posa | Marquis Posa |
| AAdolf KleinEspinosa | Espinosa |
| RRobert TaubeDuke of Alba | Duke of Alba |
 Friedrich KühneDon Perez | Don Perez |
| RRudolf BiebrachHerzog von Valois | Herzog von Valois |
 Martin HerzbergCarlos, young | Carlos, young |