Aidan Gillen

as James Joyce

as Dickinson

as F.M.

as Hector Livingstone

as Host — Presenter

as Ronald Westbourne

as Grinner(6 eps)

as F.M.

as Vasily Zarubin

as Hunne

as Drew

as Hamilton Barnes

as Freddy Darby

as Power

as Self

as Steven Shadowwhispers (voice)(1 ep)

as James Joyce

as Valentine Barber

as Butler(2 eps)

as Milo Sunter(22 eps)

as Frank Kinsella(16 eps)

as Jack Blackwell

as Peter

as Aidan

as Narrator (voice)

as Allen Hynek(20 eps)

as John Reid

as Dave Allen

as Janson

as Littlefinger (voice)

as William "Goosefat Bill"

as Robert

as Aidan

as Timothy Leary

as Timothy Leary(1 ep)

as Paul Serene(4 eps)

as Robert Lalor

as Ambrosio O'Higgins

as Janson

as Narrator

as Carver

as Will

as Pelf

as Charles J. Haughey(3 eps)

as Master

as Dr. Frank Harte

as Aberama Gold(9 eps)

as Clayton Cote

as Lars

as Gerry Devine

as Ray

as Man (Ekki Múkk)

as Everett Newcombe(5 eps)

as CIA Op

as Gerry

as Michael

as Barry Weiss

as Petyr 'Littlefinger' Baelish(60 eps)

as Patrick

as Phil Hendricks

as Phil Hendricks(6 eps)

as Aiden

as John Boy Power(10 eps)

as DI John Bloom(6 eps)

as Gus

as Miles Jackson

as Karl

as Self

as Self

as Self

as Paul

as Paul(2 eps)

as Steve Fallon

as Jimmy Colby(1 ep)

as Conor

as Joe Wilde

as Stephen

as Steve Fallon(1 ep)

as Lord Nelson Rathbone

as Dave Turner

as Tommy Carcetti(35 eps)

as Glenn Taylor(6 eps)

as Puttnam

as Carver Doone

as Frank

as Carver Doone(2 eps)

as Jeff Obold

as Francis

as Pool Player

as Stuart Jones(10 eps)

as Baby

as Paddy

as Frank

as Gerard Quigley

as Aidan Lynch

as Gypo

as Marine Wilcox

as Harry

as James Crozier(1 ep)

as Martin Kemp (as Adrian Murphy)

as Amyas Crale(1 ep)

as Prostitute Boy

as Harry(1 ep)

as Youth at Liquor Store (as Aiden Murphy)

as Gypo(1 ep)

as Jeff Barratt(1 ep)