Michael McElhatton

as Jimmy

as Eamonn McCarty

as John Potter (8 episodes)

as Narrator (2 episodes)

as Orson

as CC Ronald Gregory (7 episodes)

as Jean de Merteuil (8 episodes)

as Finbar (8 episodes)

as Tam al'Thor (3 episodes)

as Lieutenant

as Bernard de Latour

as Black Clad Alpha

as Ward

as Jafet Lindeberg

as Frank Delaney

as Self - Narrator (voice) (5 episodes)

as Prosecutor Andrei Stepashin (5 episodes)

as Sir Arthur Conan Doyle

as Poem Narrator

as Bill Tuttle (6 episodes)

as Felix (voice)

as Petrovich (voice)

as Dr. Markoe (6 episodes)

as Black Clad Alpha