Sam Neill

Merlin

Paul Curran

Arthur

Isabella Rossellini

Nimue

Jeremy Sheffield

Lancelot

Lena Headey

Guinevere

Martin Short

Frik

Mark Jax

Uther

Helena Bonham Carter

Morgan le Fay

Rutger Hauer

King Vortingern

Miranda Richardson

Lady of the Lake / Mab

John Gielgud

King Constant

James Earl Jones

Rock of Ages

Roger Ashton-Griffiths

Sir Boris

Nicholas Clay

Lord Leo

Daniel Brocklebank

Young Merlin

Billie Whitelaw

Ambrosia

Jason Done

Mordred

John McEnery

Lord Ardente

Christian Simpson

Vortigern's Guard

Sebastian Roché

Gawain

Timothy Bateson

Father Abbot

Vernon Dobtcheff

1st Physician

Joseph Mawle

Village Man (uncredited)

Thomas Lockyer

Cornwall

Agnieszka Koson

Young Nimue

Christopher Jacot

Graham

Meghan Ory

Brianna