- Colin O'Donoghue
- Â Douxie 10 episodes, 2020
- David Bradley
- Â Merlin 10 episodes, 2020
- James Faulkner
- Â King Arthur / ... 10 episodes, 2020
- Emile Hirsch
- Â Jim 10 episodes, 2020
- Lexi Medrano
- Â Claire 10 episodes, 2020
- Alfred Molina
- Â Archie 10 episodes, 2020
- Steven Yeun
- Â Steve 10 episodes, 2020
- Steve Alterman
- Â Additional Voices 10 episodes, 2020
- Kelsey Grammer
- Â Blinky 9 episodes, 2020
- Lena Headey
- Â Morgana 9 episodes, 2020
- Piotr Michael
- Â Skrael / ... 8 episodes, 2020
- Stephanie Beatriz
- Â Callista / ... 7 episodes, 2020
- Kay Bess
- Â Bellroc 7 episodes, 2020
- Angel Lin
- Â Nari 7 episodes, 2020
- John Rhys-Davies
- Â Galahad / ... 7 episodes, 2020
- Fred Tatasciore
- Â AAARRRGGHH!!! / ... 7 episodes, 2020
- Rupert Penry-Jones
- Â Lancelot / ... 6 episodes, 2020
- Clancy Brown
- Â Gunmar 5 episodes, 2020
- Paula J. Newman
- Â Additional Voices 5 episodes, 2020
- Alastair Duncan
- Â Additional Voices 5 episodes, 2020
- Daisy Tormé
- Â Additional Voices 5 episodes, 2020
- Alan Shearman
- Â Additional Voices 5 episodes, 2020
- Julie Falls
- Â Additional Voices 5 episodes, 2020
- Mark Hamill
- Â Dictactious / ... 4 episodes, 2020
- Charlie Saxton
- Â Toby 4 episodes, 2020
- Frank Welker
- Â Goblins 4 episodes, 2020
- Jim Pirri
- Â Additional Voices 4 episodes, 2020
- Joanna Leeds
- Â Additional Voices 4 episodes, 2020
- Diego Luna
- Â Krel 3 episodes, 2020
- Darin De Paul
- Â Bular 3 episodes, 2020
- Tom Kenny
- Â Dadblank / ... 3 episodes, 2020
- Victor Raider-Wexler
- Â Vendel 3 episodes, 2020
- Neil Dickson
- Â Additional Voices 3 episodes, 2020
- Peter Lavin
- Â Additional Voices 3 episodes, 2020
- Joyce Kurtz
- Â Additional Voices 3 episodes, 2020
- Matthew Waterson
- Â Draal / ... 2 episodes, 2020
- Edie Mirman
- Â Additional Voices 2 episodes, 2020
- Ike Amadi
- Â Angor Rot 1 episode, 2020
- Brian Blessed
- Â Charlemagne 1 episode, 2020
- Brook Chalmers
- Â Latch 1 episode, 2020
- Sandra Saad
- Â Zoe 1 episode, 2020
- Rajia Baroudi
- Â Additional Voices 1 episode, 2020
- Bebe Wood
- Â Shannon 1 episode, 2020
- Mitch Carter
- Â Additional Voices 1 episode, 2020
- Tom Wilson
- Â Coach Lawrence 1 episode, 2020
- Warren Sroka
- Â Additional Voices 1 episode, 2020
- Kathleen Turner
- Â Lady of the Lake 1 episode, 2020
- Megan Sheehan
- Â Additional Voices 1 episode, 2020
- Emily Goss
- Â Additional Voices 1 episode, 2020
- Peter Falls
- Â Additional Voices 1 episode, 2020
- Scott Menville
- Â Additional Voices 1 episode, 2020