In 17th century France, young d'Artagnan wants to join the King's Musketeers, but instead befriends three legendary musketeers — Athos, Porthos, and Aramis — and together, they become embroiled in the political intrigue surrounding King Louis XIII and his adversaries, particularly the powerful Cardinal Richelieu.
| Actor | Role |
|---|---|
 Walter AbelD'Artagnan | D'Artagnan |
 Margot GrahameMilady de Winter | Milady de Winter |
 Paul LukasAthos | Athos |
 Moroni OlsenPorthos | Porthos |
 Onslow StevensAramis | Aramis |
 Heather AngelConstance | Constance |
 Ian KeithCount de Rochefort | Count de Rochefort |
 Rosamond PinchotQueen Anne | Queen Anne |
 John QualenPlanchet | Planchet |
 Ralph ForbesDuke of Buckingham | Duke of Buckingham |
 Nigel De BrulierRichelieu | Richelieu |
 Murray KinnellBernajou | Bernajou |
 Lumsden HareDe Treville | De Treville |
 Miles ManderKing Louis XIII | King Louis XIII |
 Lionel BelmoreInn Proprietor | Inn Proprietor |
 Stanley BlystoneVillard | Villard |
 Wade BotelerPeylerand | Peylerand |
 Ralph FaulknerJussac | Jussac |
 Frank LackteenParis Gate Watch | Paris Gate Watch |
 Ferdinand MunierFirst Innkeeper | First Innkeeper |
 Russ PowellThe Shepherd | The Shepherd |
 Tom RickettsPigeon Receiver | Pigeon Receiver |
| CCliff SaumPalace Guard | Palace Guard |
 Lucille Ball(uncredited) | (uncredited) |
| VViola Moore(uncredited) | (uncredited) |