- Charlie Hunnam Rey Arturo
- Jude Law Vortigern
- Astrid Berges-Frisbey La Maga
- Djimon Hounsou Bedivere
- Aidan Gillen Bill
- Eric Bana Uther
- Annabelle Wallis Maggie
- Tom Wu George
- Mikael Persbrandt Greybeard
- Michael McElhatton Jack's Eye
- David Beckham Trigger
- Georgina Campbell Kay
- Kingsley Ben-Adir Wet Stick