Patrick Stewart
Old Merlin
Joey Ansah
Policeman
Claudie Blakley
Riding Instructor
Adam Leese
Policeman
Genevieve O'Reilly
Sophie
Adam Buxton
Stonehenge Tour Guide
Nathan Stewart-Jarrett
Mr. Kepler
Alexandra Roach
Ms. Foster
Noma Dumezweni
Mrs. Lee
Rebecca Ferguson
Morgana
Denise Gough
Mrs. Elliot
Mark Bonnar
Mr. Jeffreys
Myra McFadyen
Punto Patty
Nick Mohammed
Mr. Hyde
Angus Imrie
Merlin
Tom Taylor
Lance
Louis Ashbourne Serkis
Alexander "Alex" Elliot
Amir Wilson
Boy (uncredited)
Dean Chaumoo
Bedders
Rhianna Dorris
Kaye