The opening has the dashing Earl of Huntingdon besting his bitter enemy, Sir Guy of Gisbourne, in a joust. Huntingdon then joins King Richard the Lion-Hearted, who is going off to fight in the Crusades and has left his brother, Prince John, as regent. The prince soon emerges as a cruel, treacherous tyrant. Goaded on by Sir Guy, he usurps Richard's throne. When Huntingdon receives a message from his paramour, Lady Marian Fitzwalter, telling him of all that has transpired, he requests permission to return to England. King Richard assumes that the Earl has turned coward and denies him permission. The Earl seeks to leave in spite of this, but is ambushed by Sir Guy and imprisoned as a deserter. Upon escaping from his confines, he returns to England, endangering his life and honor, to oppose Prince John and restore King Richard's throne. He finds himself and his friends outlawed and Marian apparently dead.
In the Caribbean, late in the 18th century, Captain Vallo (Burt Lancaster), a pirate known as "The Crimson Pirate", and his crew capture a ship of the King's navy. The ship is carrying Baron Gruda (Leslie Bradley), the special envoy to the King, who is on his way to the Island of Cobra to help crush a rebellion by rebels opposed to the King's rule. Vallo proposes to make money by selling the weapons on the ship to El Libre, the leader of the rebels. Baron Gruda then proposes to pay Vallo money if he can capture El Libre and bring him to him. Vallo accepts and Baron Gruda and his crew are released, Vallo keeping their ship and releasing Gruda and his men onto his own. While some of the pirates complain that this is not pirate business, they soon come around when they find out the amount of money to be made.
In 17th century England, an Irish doctor named Peter Blood (Errol Flynn) is summoned to aid Lord Gildoy, a wounded patron who had participated in the Monmouth Rebellion. Arrested while performing his duties as a physician, he is convicted of treason against the King and sentenced to death by the infamous Judge Jeffreys. By the whim of King James II, who sees an opportunity for profit, Blood and the surviving rebels are transported to the West Indies to be sold into slavery.
In 1465, honorable but penniless Scottish knight Quentin Durward (Robert Taylor) agrees to go to France to find out if the beautiful young heiress, Isabelle, Countess of Marcroy (Kay Kendall), would be a suitable wife for his aged uncle (that is, if she is as rich as is claimed). The marriage has been arranged by Charles, Duke of Burgundy (Alec Clunes) for his ward to cement an alliance with Scotland, but she wants nothing to do with it, so she runs away and seeks the protection of Charles' great rival, Louis XI (Robert Morley), King of France. Quentin pursues and manages to foil an attempted robbery by brigands under the command of Count William de La Marck (Duncan Lamont), though Isabelle continues on her way unaware of her protector's identity.
At the instigation of his half brother Lionel (Lloyd Hughes), Oliver Tressilian (Milton Sills), a wealthy baronet, is shanghaied and blamed for the death of Peter Godolphin (Wallace MacDonald), brother of Oliver's fiancée, whom Lionel actually has slain. At sea Oliver is captured by Spaniards and made a galley slave, but when he escapes to the Moors he becomes Sakr-el-Bahr, the scourge of Christendom. Learning of Rosamund's (Enid Bennett) impending marriage to his half brother, he kidnaps both of them, but to avoid the risk of giving her to Asad-ed-Din (Frank Currier), the Basha of Algiers, he surrenders to a British ship. Rosamund intercedes to save his life, and following the death of Lionel they are married.
The film begins with King Philip II of Spain (Montagu Love) declaring his intention to destroy England and after this "puny rockbound island as barren and treacherous as her Queen" is out of the way, he believes that world conquest will follow: he says his great wall map, one day, "will have ceased to be a map of the world; it will be Spain." He sends one of his courtiers, Don Alvarez (Claude Rains), as his ambassador to allay the suspicions of Queen Elizabeth I (Flora Robson) about the great armada he is building to invade England. In England, some of the Queen's ministers plead with her to build a fleet, which she hesitates to do in order to spare the purses of her subjects.
Don Diego Vega (Tyrone Power) is urgently called home by his father. To all outward appearances, he is the foppish son of wealthy ranchero and former Alcade Don Alejandro Vega (Montagu Love), having returned to California after his military education in Spain. Don Diego is horrified at the way the common people are mistreated by the corrupt Alcalde, Luis Quintero (J. Edward Bromberg), who had forced his father from the position. Don Diego then adopts the guise of El Zorro ("The Fox"), a masked outlaw, who becomes the defender of the common people and a champion for justice. Meanwhile, he romances the Alcalde's beautiful and innocent niece, Lolita (Linda Darnell), whom he grows to love. As part of his plan, Don Diego simultaneously flirts with the Alcalde's wife Inez (Gale Sondergaard), filling her head with tales of Madrid fashion and culture and raising her desire to move there with her corrupt husband. In both his guises, Don Diego must contend with the governor's ablest henchman, the malevolent Captain Esteban Pasquale (Basil Rathbone). He eventually dispatches the Captain in a fast-moving rapier duel-to-the-death, forcing a regime change, Don Diego's plan all along.
At the Durrisdeer estate in Scotland in 1745, Jamie Durie (Errol Flynn), his younger brother Henry (Anthony Steel) and their father Lord Durrisdeer (Felix Aylmer) receive news of the Jacobite rising. Their retainer, MacKellar (Mervyn Johns), recommends that one brother join the uprising while the other remains loyal to King George II, so that whichever side wins, the family's status and estate will be preserved. Both brothers want to go. Jamie insists on tossing a coin for the privilege and wins, despite the opposition of his fiancée, Lady Alison (Beatrice Campbell).
In seventeenth century Paris, poet and supreme swordsman Cyrano de Bergerac (José Ferrer) stops a play from being shown because he cannot stand the bombastic style of the principal actor, Montfleury (Arthur Blake). An annoyed aristocratic fop, the Vicomte de Valvert (Albert Cavens), provokes him into a duel by tritely insulting Cyrano's enormous nose. Cyrano first mocks his lack of wit, improvising numerous inventive ways in which Valvert could have phrased it (much to the amusement of the audience). He then composes a ballade for the occasion on the spot and recites it during the swordfight. With the last line, he stabs his opponent.
In Tudor England, two boys are born on the same day in the most different circumstances imaginable. Tom (Billy Mauch) is the son of vicious criminal John Canty (Barton MacLane), while Edward VI (Bobby Mauch) is a prince and the heir of King Henry VIII of England (Montagu Love). One grows up in poverty, hungering for something better for himself and his family, the other in isolated luxury, with a strong curiosity about the outside world.
Captain Thomas Bartholomew Red and his first mate, Frog, are stranded aboard a raft at sea. Close to death from starvation and dehydration, Red tries to kill and eat Frog, but they are rescued by a Spanish galleon and are forced into slavery. Red inspires the slaves to mutiny and takes control of the vessel. Frog falls in love with the niece of a Spanish colonial governor, and unsuccessfully romances her. Red covets a golden throne that the Spanish have taken from an Aztec king. Through several adventures, Red recruits a crew of cutthroats to steal the throne. Despite their efforts, Red and Frog are ultimately stranded on a raft again, where Red sits on his golden throne and urges Frog to "fatten up".
After seizing a British ship, the female pirate captain Anne Providence (Jean Peters) spares Pierre LaRochelle (Louis Jourdan), a Frenchman captured by the British, from walking the plank. He agrees to join Providence's crew and soon she begins to fall for the handsome officer.
James (Niven), the Duke of Brampton and the richest man in England, is so trusted by King Charles II (Sanders), he is able to have two of the King's loyal friends executed for treason. The second is the father of Lady Mary (Blyth). She travels from France to London to seek justice. While there, she meets Michael Dermott (Purdom), a soldier who fought to restore Charles to the throne.
Le jeune gascon d'Artagnan arrive à Paris, prêt à rejoindre les mousquetaires du roi. Il est pris sous les ailes des trois mousquetaires les plus respectés et les plus redoutés, Porthos, Aramis et Athos. Ensemble, ils se battent pour sauver la France et l'honneur d'une dame des machinations du puissant cardinal Richelieu.