After the King of England, Uther Pendragon, dies, leaving no heir to the throne, a sword appears inside an anvil in London. The sword bears an inscription proclaiming that whoever removes it will be the new king. No one can remove the sword, which is eventually forgotten, leaving England in the Dark Ages.
Years later, a 12-year-old orphan named Arthur, commonly called Wart, accidentally scares off a deer his foster brother Kay was hunting, causing Kay to launch his arrow into the forest. In retrieving the arrow, Arthur lands in the cottage of Merlin the wizard, who declares himself Arthur's tutor and returns with the boy to his home, a castle run by Sir Ector, Arthur's foster father. Ector's friend, Sir Pellinore, arrives with news that the annual jousting tournament will be held on New Year's Day in London, and the winner will be crowned king. Ector decides to put Kay through serious training for the tournament and appoints Arthur as Kay's squire.
In order to educate Arthur, Merlin transforms the boy and himself into fish. They swim in the castle moat in order to learn about physics, but more importantly for Arthur to rely upon intellect in facing dangerous situations (brain rather than brawn). Arthur is attacked by a pike but is saved by Archimedes, Merlin's pet owl. Arthur is sent to the kitchen as punishment for trying to relate his lesson to a disbelieving Ector. Merlin enchants the dishes to wash themselves, then takes Arthur for another lesson, turning them into squirrels to learn about gravity, and to understand to think before acting ("look before you leap). During their trip, two female squirrels fall in love with them. Arthur is nearly eaten by a wolf, but is saved by the female squirrel before Merlin returns them to human form. While Merlin's pursuer is first scared then angry at this, Arthur's pursuer is heartbroken. When Merlin and Arthur return to the castle, Ector accuses Merlin of using black magic on the dishes. Arthur defends Merlin, but Ector refuses to listen and punishes Arthur by giving Kay another squire, Hobbs.
Resolving to make amends, Merlin plans on educating Arthur full-time. However, Merlin's knowledge of future history causes confusion, prompting Merlin to appoint Archimedes as Arthur's teacher. When Arthur imagines what it would be like to fly, Merlin transforms him into a sparrow and Archimedes teaches Arthur how to fly. However, during their lesson Arthur is attacked by a hawk and falls into the chimney of Madam Mim, an evil witch and Merlin's arch-nemesis. Mim's magic uses trickery, as opposed to Merlin's scientific skill. Merlin intervenes before Mim can destroy Arthur, and she challenges him to a Wizards' Duel. Despite Mim's cheating, Merlin outsmarts her by transforming into a germ called "Malignalitaloptereosis" that infects her with a chickenpox-like disease, effectively defeating her and illustrating the importance of knowledge over strength.
On Christmas Eve, Kay is knighted, but Hobbs comes down with the mumps, forcing Ector to reinstate Arthur as Kay's squire. This causes a falling-out between Arthur and Merlin, who angrily transports himself to Bermuda when Arthur defends his choices. On the day of the tournament, Arthur realizes that he has left Kay's sword at an inn, which is now closed for the tournament. Archimedes sees the Sword in the Stone, which Arthur removes, unknowingly fulfilling the prophecy. When Arthur returns with the sword, Ector recognizes it and the tournament is halted. Ector places the sword back in its anvil, demanding Arthur to prove that he pulled it. Thinking anyone can pull the sword now, Kay and others try unsuccessfully to retrieve it. Sir Pellinore and another knight, Sir Bart, stand up for Arthur and encourage him to pull the sword again. He does so, revealing that he is England's rightful king and earning Ector's and Kay's respect.
Arthur, crowned king, sits in the throne room with Archimedes, feeling unprepared to take the responsibility of royalty. Overwhelmed by the cheering crowd outside, Arthur calls out to Merlin for help. Merlin returns from Bermuda (and the 20th century) and is elated to find that Arthur is the king that he saw in the future. Merlin tells Arthur that he will go on to lead the Knights of the Round Table and become famous, starring in books and even movies, which (as usual) confuses Arthur.
- Scenes from the film appear in "The Dark Swan" and in "Nimue".
- Merlin and his apprentice make a sword and put it in a stone to see who rules Camelot.
- Later, Arthur pulls the sword from the stone to find it's bottom tip missing.
- The young apprentice dresses similar to Arthur/Wart in the movie.
- Once Merlin gets his magic, he creates his tower and lives in it, until he is turned into a tree. Later, Arthur makes a castle appear around the tower, with enchanted sand.
- When he was a child, Arthur already knew that he would become the king.
- Kay dies after trying to pull the sword from the stone.
- Arthur meets Merlin for the first time when he is an adult.
|Original Character||Adapted as||First Featured in|
|Arthur||King Arthur||"The Dark Swan"|
|Wart||The Apprentice (allusion)||"Nimue"|
|Sir Kay||Sir Kay||"The Dark Swan"|
|Original Item||Adapted as||First Featured in|
|The Sword in the Stone||Excalibur||"The Dark Swan"|
|Original Location||Adapted as||First Featured in|
|England||Camelot||"The Dark Swan"|
|Merlin's Tower||Merlin's Tower||"Nimue"|
|Sir Ector's Castle||Camelot Castle (allusion)||"The Dark Swan"|
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