Arthur is a streetwise young man unaware of his noble lineage, having been raised in a brothel in Londinium after the murder of his parents. His father, King Uther Pendragon, was betrayed and killed by his own brother, Vortigern, who sought the throne for himself. Once grown, Arthur is forced to confront his past when he somehow succeeds in pulling the legendary sword Excalibur from a stone— an act that reveals his true heritage. Haunted by memories of that fateful night and driven by the sword’s mysterious power, Arthur must come to terms with his claim to the throne and his destiny to become a king.

As he grapples with his newfound identity, Arthur joins a group of rebels, including a wise mage who guides him on his journey to acceptance and rebellion. Together, they endeavor to overthrow Vortigern, who has become a tyrant, ruling with an iron fist and dark magic. Arthur must navigate the treacherous political waters of a kingdom in turmoil, battling not only his uncle's forces but also his own doubts and fears, in order to reclaim his birthright and restore peace to the land.