In medieval England, Merlin and King Arthur banish the evil enchantress Morgana and her son Mordred to the ends of the universe as Morgana vows revenge. In current day, Knights descendant Penn does not take a lot inventory within the legends of his supposed ancestors, even because the descendants meet in Thailand to apply preventing. However when Morgana and her son return to earth, armed with alien expertise and hell-bent on destroying each final descendant of King Arthur and his knights, Penn should to return to phrases with who he was born to be, and produce collectively the brand new Knights of the Spherical Desk to save lots of themselves and the earth from Morgana's complete vengeance.