In medieval England, the sorceress Morgana and her son Mordred are exiled to the farthest reaches of the universe by Merlin and King Arthur, with Morgana swearing to seek revenge. Fast forward to the present day, where Penn, a descendant of the Knights, is skeptical about the legends of his forebears, even as their descendants gather in Thailand to hone their combat skills. However, when Morgana and Mordred return to Earth, equipped with advanced alien technology and intent on annihilating all of King Arthur’s lineage, Penn must embrace his heritage. He must unite the modern Knights of the Round Table to thwart Morgana’s plan for complete retribution and protect both themselves and the planet.