• 
  David Bradley

  Merlin
• 
  James Faulkner

  King Arthur
• 
  Colin O'Donoghue

  Douxie
• 
  Lena Headey

  Morgana
• 
  Emily Goss

  (voce)
• 
  Alastair Duncan
• 
  Kathleen Turner

  Lady of the Lake
• 
  Clancy Brown

   Gunmar

• 
  Alfred Molina

  Archie
• 
  Kelsey Grammer

   Blinky
• 
  Steve Alterman

   Additional Voices
• 
  Kay Bess

   Bellroc
• 
  Emile Hirsch

   Jim
• 
  Paula J. Newman

   Additional Voices
• 
  Rupert Penry-Jones

  Lancelot

• 
  John Rhys-Davies

   Galahad / ...
• 
  Alan Shearman

   Additional Voices
• 
  Fred Tatasciore

   AAARRRGGHH!!! / ...
• 
  Daisy Tormé

   Additional Voices
• 
  Angel Lin

   Nari
• 
  Steven Yeun

  Steve
• 
  Piotr Michael

   Skrael / ...
• 
  Stephanie Beatriz

   Callista / ...
• 
  Lexi Medrano

  Claire
• 
  Julie Falls

   Additional Voices