Colm Meaney

as J. Pierpont Morgan

as Jack

as Ethan Mack

as Ian Bailey

as Medusa(1 ep)

as Ray

as Kieran Walsh(8 eps)

as Ciáran

as Frank Monaghan

as Caleb

as Brandon

as The No Man/ Bill(1 ep)

as Storyteller(6 eps)

as Robert McQue

as Jonathan

as Bernie Ohls

as Colm “Daddy” Whelan

as Mr. Barr

as Francis I of France(1 ep)

as Martyn

as Father Peter

as MacDonell

as Self / Narrator(3 eps)

as Dermot O'Brien

as Major Brendan Archer(6 eps)

as Finn Wallace(10 eps)

as Patrick Barker

as Frank Ellroy

as Detective Donall Crowley

as Father Francis Morgan

as Self

as Big Daddy

as James Burbage(10 eps)

as Martin Logan

as Martin McGuinness

as Father Avital

as George Raynor

as Coach George Raynor

as Self(2 eps)

as Grandfather (voice)

as Wainwright(3 eps)

as Self - Narrator (voice)

as Leslie

as Miles O'Brien

as Elder Beacon

as The Horse(3 eps)

as Fintan McGuire

as Myles Standish (voice)

as Detective

as Roland Potts

as Patt Farrell

as Chief Miles O'Brien (archive footage)

as Mason

as Bandler

as Monsieur Rousset

as Self

as Thomas 'Doc' Durant(57 eps)

as Mark O'Reilly

as Detective Weller

as David Hunter

as Giannopoulos

as Harry

as H.L. Mencken

as Fred Daly

as Jonathan Snow

as King of Hearts(2 eps)

as Frank Kensay

as Detective Dunnigan

as Don Revie

as George Titac(8 eps)

as Tommy Cassidy

as Trevor Jones

as Joe Mullan

as Bob O'Donnell(2 eps)

as Gavin

as Peter Howell(2 eps)

as Charge D'Affaires(1 ep)

as Vincent

as Cody

as Shelley Kelly(2 eps)

as Tom

as Self

as Benjamin Franklin

as Gene

as Inspector Brackenreid

as Cowen(3 eps)

as Inspector Brackenreid

as Inspector Brackenreid(3 eps)

as Gibbons

as Jimmy McClure

as Self

as Jimmy

as Jerry Lynch

as Mr. Tumlinson

as Harry

as Thomas Hutchings

as Gin O'Malley

as Harold Garrett(2 eps)

as Frank Lazaras

as Seamus Muldoon(2 eps)

as Mayor Scott Pitcher

as Fury

as Seamus

as Al Sheehan

as Roland Cain

as Steve

as Jackie O'Hara

as Keith Moore

as Agent Duncan Malloy

as Jim Davern

as Larry

as Self

as Self

as Miles O'Brien

as Morgan the Goat

as Self

as Father Colum O'Hara(2 eps)

as Dr. Lionel Badger

as Mr. Dugan (voice)(1 ep)

as Geronimo's Dad

as Self

as Dessie Curley

as Himself

as Miles O'Brien(173 eps)

as Jake Slicker(1 ep)

as Barreller

as Daumer

as Major Ambrose

as Kelly

as Jimmy Rabbitte, Sr.

as Wyatt Landon(1 ep)

as Gerry McGurn

as Windsor Plane - Pilot

as Cop at Tess'

as Tom O'Flanagan (voice)(1 ep)

as Meagher

as Tinkerer

as Miles O'Brien(53 eps)

as Mr. Bergin

as Sean

as Irwin Malcolm(1 ep)

as Keterina Suitor (as Colm Meany)(1 ep)

as Dessie Curley(1 ep)

as Constable(1 ep)

as Kevin Murphy

as Younger Protestant

as Peter Smolett(1 ep)

as Self(1 ep)