<P> Arthur surrenders himself, but as Vortigern is about to execute his nephew, a giant snake summoned by the mage attacks and devours Vortigern's men . While Bedivere and the others lead an attack on the castle, a desperate Vortigern sacrifices his only daughter and is transformed into the demon knight, confronting Arthur in a separate dimension . Despite his fighting skill, Arthur is beaten, and he is about to submit when he witnesses a vision of his father, convincing him to accept the sword and his character as his own . Arthur violently slays Vortigern but blesses him as he dies . </P> <P> In the aftermath, Arthur dissolves Vortigern's pact with the Vikings and begins building a Round Table where his knighted friends will meet . Blue and the prostitutes arrive with the crown of Uther, which Arthur accepts, holding the sword aloft . </P> <Ul> <Li> Charlie Hunnam as King Arthur, Uther's son, Vortigern's nephew and the would - be king of Britain who was raised by prostitutes . </Li> <Li> Àstrid Bergès - Frisbey as the Mage, a woman working for Merlin who supports Arthur and the resistance . </Li> <Li> Djimon Hounsou as Sir Bedivere, the leader of the resistance and a former knight of Uther . </Li> <Li> Aidan Gillen as Goosefat Bill, a skilled archer, Bedivere's friend, former knight of Uther and member of the resistance . </Li> <Li> Jude Law as Vortigern, Uther's brother, Elsa's husband, Catia's father, Arthur's uncle and the tyrannical ruthless king of Britain . </Li> <Li> Eric Bana as Uther Pendragon, Vortigern's brother, Arthur's father and the king of Britain . </Li> <Li> Kingsley Ben - Adir as Sir Tristan "Wet Stick", Arthur and Back Lack's childhood friend who is later knighted by Bedivere . </Li> <Li> Craig McGinlay as Sir Percival, a member of the resistance who is later turned knighted by Bedivere . </Li> <Li> Tom Wu as Sir George, Arthur's mentor and a skilled fighter who helps the resistance and is later knighted by Bedivere . </Li> <Li> Neil Maskell as Back Lack, Arthur and Tristan's childhood friend and Blue's father, who helps the resistance . </Li> <Li> Freddie Fox as Rubio, a member of the resistance who later betrays them under torture and helps Vortigern . </Li> <Li> Annabelle Wallis as Maggie, Vortigern's maid who helps the resistance . </Li> <Li> Bleu Landau as Blue, Back Lack's son . </Li> <Li> Mikael Persbrandt as Greybeard, a viking who has deals with Vortigern . </Li> <Li> Poppy Delevingne as Igraine, Arthur's mother and Uther's wife: she is killed by Vortigern in the beginning of the film . </Li> </Ul> <Li> Charlie Hunnam as King Arthur, Uther's son, Vortigern's nephew and the would - be king of Britain who was raised by prostitutes . </Li>

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