Tom (1 episode)

Producer

The Fisherman

Frank

Producer

Self - Guest (1 episode)

Dad

Theo Rose

Executive Producer

Uncle Nubar

Executive Producer

Vincent (6 episodes)

Executive Producer (6 episodes)

Benjamin

Mr. Thomas (voice)

AB

Executive Producer

Harry Pope

Henry Sugar / Make-Up Artist

Self (1 episode)

Self - Narrator (voice) (6 episodes)

Daddy (voice)

Self (1 episode)

Doctor Stephen Strange

Stephen Strange / Doctor Strange (archive footage) (uncredited) (2 episodes)

Self (1 episode)

Self (1 episode)

Doctor Strange

Self (1 episode)

Self (2 episodes)

Phil Burbank

Louis Wain

Executive Producer

Doctor Strange (voice) (3 episodes)

Doctor Strange / Strange Supreme (voice) (1 episode)

Doctor Strange / Strange-Supreme (voice) (1 episode)

Strange Supreme / Demon Strange (voice) (1 episode)

Lt. Stuart Couch

Producer

Greville Wynne

Executive Producer

Colonel MacKenzie

Self (1 episode)

Benedict Cumberbatch

Satan (voice) (1 episode)

Doctor Strange

The Grinch (voice)

Dominic Cummings

Shere Khan (voice)

Grinch (voice)

Stephen Lewis

Executive Producer

Patrick Melrose (5 episodes)

Executive Producer (5 episodes)

Self (1 episode)

Doctor Strange

Thomas Edison

Doctor Strange

Self - Host (2 episodes)

Self - Cameo (uncredited) (1 episode)

Dr. Stephen Strange

Richard (1 episode)

Richard III (1 episode)

All

Himself

Sherlock Holmes

Billy Bulger

Self (3 episodes)

Smaug / Sauron (voice)

Classified (voice)

Self (1 episode)

Self (3 episodes)

Alan Turing

Little Charles Aiken

Sherlock Holmes

Smaug / Sauron

Wallace

self (1 episode)

William Ford

Julian Assange

Self (1 episode)

Self (1 episode)

John Harrison / Khan

Self (8 episodes)

Self - Guest (2 episodes)

Severus Snape / Prime Minister (voice) (1 episode)

Quilloughby (voice) (1 episode)

Necromancer

Narrator (Voice) (2 episodes)

Narrator (voice) (3 episodes)

Christopher Tietjens (5 episodes)

Maj. Jamie Stewart

David

Peter Guillam

Self (1 episode)

Self - Presenter (1 episode)

Self - Host (1 episode)

Nick Kaufman

Self (1 episode)

Self - Guest (1 episode)

Sherlock Holmes (12 episodes)

James

Negotiator

Stephen Hawking (3 episodes)

Henry Clark

Bernard (2 episodes)

Joseph Dalton Hooker

Luke Fitzwilliam (1 episode)

Guy Burgess

Self - Narrator (voice) (6 episodes)

William Carey

Stephen Ezard (5 episodes)

Alexander Masters

Joe / Charlie

Paul Marshall

William Pitt

Patrick Watts

Will Parker (6 episodes)

Edmund Talbot (3 episodes)

Robin (2 episodes)

Stephen Hawking

Lt Jimmy Langley (3 episodes)

Rory Slippery (6 episodes)

Jim North (1 episode)

Royalist

Edward Hand (1 episode)

Freddy (1 episode)

Warren Reid (2 episodes)

Jeremy

The Man

Toby Fisher (1 episode)

Charles (1 episode)