| Errol Flynn | Don Juan de Maraña |
| Viveca Lindfors | Queen Margaret |
| Robert Douglas | Duke de Lorca |
| Alan Hale | Leporello |
| Ann Rutherford | Donna Elena |
| Raymond Burr | Captain Alvarez |
| Romney Brent | King Phillip III |
Don Juan de Maraña is a Spanish nobleman with a reputation for having many lovers, but the woman who has truly captured his heart is none other than Queen Margaret, who is unhappily married to King Philip III . When Don Juan uncovers a plot by the devious Duke de Lorca to dethrone the royal family, he rallies his trusted friends and rushes to defend both his country and his beloved queen.
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