Scooby-Doo! The Sword and the Scoob

An airport passenger watches a Thundarr the Barbarian clip on his tablet as the flight departs. A gremlin creature appears on the wing and damages the aircraft, sending passengers into a panic. The Scooby-Doo gang—Shaggy, Scooby, Fred, Daphne and Velma—manage to capture the monster with a parachute and hand it over to the police. DNA evidence later reveals that Shaggy's ancestry traces to a village in England.

Opening credits show clips of the gang's journey to England as they arrive in a small English village. They learn from locals that Shaggy is descended from a legendary knight who once thwarted Morgan le Fay's bid to seize Camelot. The discovery ties Shaggy to the kingdom's ancient destiny and to the legend of King Arthur.

That night, Morgan le Fay attacks the gang and uses magic to hurl them back in time to the era of King Arthur. The friends realize they are now part of a legendary story and decide to follow history to find a way back to their own time. They arrive in Camelot amid medieval splendor and prepare to participate in the kingdom's affairs.

Shaggy pulls Excalibur from the stone, unwittingly challenging Arthur's right to the throne. Arthur explains that the throne must be decided by a competition among knights. Shaggy chooses Fred for his team, while Arthur takes the entire Order of the Round Table to judge the contest.

Morgan le Fay paralyzes Fred, forcing Daphne to take his place in the competition. Velma becomes Merlin's apprentice to learn magic and figure out a way for the gang to return to their own time.

Daphne defeats the knights of the Round Table, proving her skill and giving Shaggy a claim to the throne. Shaggy is declared the new king after the duel of wits and prowess.

Morgan le Fay returns and kidnaps Shaggy, removing him from the competition and the throne. The kidnapping escalates the crisis as the rest of the gang races to rescue him.

The gang and Arthur trace Morgan to her lair, only to discover that Shaggy has been tricked into signing away the throne in exchange for a banquet. Morgan transforms herself into a dragon to kill them, but the group overcomes her with teamwork and courage.

Velma reveals the Camelot adventure was staged by the townsfolk using a Camelot-themed attraction with actors and special effects to fool the gang into believing they traveled back in time. The townspeople fear Shaggy might claim their town as his birthright and manipulate events to stop him.

King Arthur reveals himself as Winston Pilkingtonshire, an actor who previously portrayed Thundarr. The reveal reframes the entire experience as an elaborate ruse designed to keep the town's power intact.

While Shaggy has no interest in ruling the town, the town librarian who posed as Morgan le Fay steals the deed and drives off with the profits. Using Winston's lorry disguised as an animatronic dragon, the gang and Winston intervene and stop her; the police apprehend her.

The town throws a party to celebrate the gang's return and bravery. Velma learns Merlin wasn't hired as part of the attraction, and the apparent Merlin she encountered disappears at the end, hinting that real magic may exist.