Allie Pennington, the daughter of two medieval literature scholars, transfers to Avalon High and becomes involved in a prophesied re-staging of Arthurian legend. Allie meets various new people who she later discovers are the reincarnations of figures from the legendary Camelot. She befriends two boys: Will, a quarterback and most likely the reincarnation of Arthur, and Miles, who has psychic flashes and is most likely the reincarnation of Merlin. There's also a third boy, Marco—Will's stepbrother—whom Allie believes is the reincarnation of Mordred and determined to kill Arthur, which would send the world into another dark age. At Avalon high, the school Allie attends, Allie gets assigned to a project in which Miles becomes her partner. When they are studying together at her house, they receive help from her parents who co-wrote the book which they are doing the project on. As Allie gets closer to her classmates, she starts to experience visions of King Arthur and becomes better friends with Will. She starts to suspect that the legend of the prophecy is true. She discovers at a party that Jennifer and Lance are having an affair behind Will's back. She fears that if Will found out he would suffer the same fate as King Arthur and meet his downfall, while her own feelings for Will start to grow. Together, Miles and Allie discover the day King Arthur is prophesied to return. Will suffers from a blow both in school and at practice that shakes his confidence before the big game, which Will has to win in order to gain a scholarship. Allie tries to tell Will about Jennifer and Lance's affair but is constantly "interrupted", so she enlists the help of Mr. Moore to protect Will. On the night of the game Will arrives early to school and sees Jennifer and Lance together and takes off; Allie and Marco give chase. Finding Will at the forest where they had previously spent time together, she tells him that he is King Arthur, but he takes it as a metaphor about him returning to the game. Allie and Miles then attend and watch as Will returns to the game as the prophesied eclipse and meteor shower take place. At half time, Lance apologizes to Will for the affair but Will instead gives his blessing for Lance and Jennifer to be together, forgiving them both. Will then asks to meet Allie after the game, but he disappears. Allie and Miles go in search and Miles uses his psychic power to find him. Going to the school theater, they find an injured Marco outside and Will inside the theater, again Allie tells him the truth of his identity. Mr. Moore arrives and reveals that he is really Mordred and Marco reveals that his father was actually a member of the Order of the Bear before he died. Ever since he died, Marco has sworn to continue his father's job to protect Arthur, and had been trying to gain Mr. Moore's trust. Mr. Moore then attacks the group. Allie grabs a prop sword to stop Mr. Moore, but it transforms into Excalibur, revealing that she is the real reincarnation of King Arthur. Mr. Moore and Allie duel in an alternate reality, where Will, Marco, Miles, and Lance are also present and fighting. With the help of Merlin, Allie defeats Mordred. Back in the theater, they are able to escape and Mr. Moore is "detained". Will then returns from the afterlife and promises to talk with Allie afterward, and he proceeds to win the game of life. Miles now embraces his powers and becomes more social which gets him a girlfriend. At the end of the game, Will kisses Allie. All the characters gather together at the round table dressed as their legendary counterparts. The movie closes with Allie riding along the beach with a horse.
Filming took place in Auckland, New Zealand, from May 3 to June 3, 2010. Bethells Beach was used as a location for full-armour battle sequences. Mechnology Visual Effects created 134 visual effects shots for the production.
