Kirk Barker as Arthur

Adrian Bouchet as Lucan

David Sterne as King Vortigern

Nigel Cooke as Aberthol

Charlotte Brimble as Olwen

Nicholas Asbury as Orin

Garth Maunders as Faelan

Andrew Grose as Brian

Joseph Attenborough as Eogan

Jack Rigby as Anyon

Alison Harris as Branwen

Stefan Butler as Myrrdin

Harvey Walsh as Young Arthfael

Jack Maw as Young Myrrdin

Hattie Pardy-McLaughlin as Young Nia

Helen Phillips as Nia

Gareth Bennett-Ryan as Brice

Kiel O'Shea as Drest

Ben Boorman as Yorath

Karin Floengard Jonsson as Radha

Nathaniel Marten as Rogan

Delilah Gyves-Smart as Pregant Woman

Ethan Mckinley as Torquil

David Morrell as Hunter

Robin Berry as Scrawny Villager

Ben Craze as Grizzly Villager

Bartley Burke as Excited Villager Eric

Amy Floyd as Celtic Warrior (uncredited)