Sam Neill

Merlin

Miranda Richardson

Lady of the Lake

John Reardon

Jack

Meghan Ory

Brianna

Tegan Moss

Yvonne

Christopher Jacot

Graham

Garwin Sanford

Weston

Duncan Fraser

Sir Thomas

Alexandr Kalugin

Rauskaug

Jennifer Calvert

Mistress Deborah

Andrew Jackson

Master Burton

Mackenzie Gray

One-Eye

Woody Jeffreys

Arthur

Teach Grant

Stromnian

Mark Gibbon

Gare

Clint Carleton

Swimming Knight

Jeremy Guilbaut

William

Garvin Cross

Colin

Gary Lauder

Hugh

Darren Shahlavi

Chester

Connor Stanhope

Young Arthur

Evan Smith

Young Jack

Brenna O'Brien

Young Brianna

Jessica King

Young Yvonne

David Nykl

Brianna's Father

Andrew Kavadas

King Griffyth

Lindsay Collins

Captive Woman

Michael Daingerfield

Pig (voice)