Tyrannical King Louis XIV learns that he has an identical twin brother, Philippe, who was raised from birth by his late father's trusted friend D'Artagnan and his faithful musketeers, Porthos, Athos and Aramis. After Philippe falls for the king's betrothed, Spanish Princess Maria Theresa, Louis imprisons him, forcing his brother to don an iron mask that will slowly suffocate him -- and it's up to D'Artagnan to rescue him.
Louis Hayward
as King Louis XIV / Philippe of Gascony
Joan Bennett
as Princess Maria Theresa
Warren William
as D'Artagnan
Joseph Schildkraut
as Fouquet
Alan Hale
as Porthos
Walter Kingsford
as Colbert
Miles Mander
as Aramis
Bert Roach
as Athos
Marion Martin
as Mlle. de la Valliere
Montagu Love
as Spanish Ambassador
Doris Kenyon
as Queen Anne
Albert Dekker
as Louis XIII
