|Errol Flynn||Don Juan de Maraña|
|Viveca Lindfors||Queen Margaret|
|Robert Douglas||Duke de Lorca|
|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.