Chris O'Dowd

as John O'Dowd

as Niall O'Dowd

as (voice)

as (voice)

as John

as Self(1 ep)

as Séamas O'Reilly (voice)

as Mopple (voice)

as Self(1 ep)

as Self - Cameo (uncredited)(1 ep)

as Dermot

as Jack E. McCarthy(2 eps)

as Narrator (voice)

as Dusty(20 eps)

as Phillip

as Kwan the Macaque (voice)

as Flanny O'Lympic (voice)(1 ep)

as Flanny the Lovebug (voice)(1 ep)

as Roland

as Jack Maynard

as Alan 'Wilko' Wilkinson

as Finn's Dad (voice)

as Tom(10 eps)

as Self

as Shamus the Coachman (voice)

as Duncan Thomson

as Nicholas

as Mundy

as Douglas Downey

as Self(1 ep)

as Miles Daly(27 eps)

as Postman Joseph Roulin

as Boone

as Frank

as Tommy 'Zook' Zucarello

as David Walsh

as Self - Guest(1 ep)

as Self - Guest(1 ep)

as Narrator (voice)(39 eps)

as Lennie

as Brother Geraghty

as Dr. Cockroach Ph.D.

as Jack Brennan

as Nurse

as Self - Guest(2 eps)

as Drew

as Self(1 ep)

as Self - Roy Trenneman

as Richard

as Dr. Cockroach (voice)

as Grub (voice)

as Tom Chadwick(8 eps)

as Dr. Cockroach Ph.D.(50 eps)

as Self(1 ep)

as Ronnie

as Bruce

as Sean Murphy(18 eps)

as Dave Lovelace

as Thomas-John(5 eps)

as Alex

as Self

as Mike(1 ep)

as Rhodes

as William Rackham(4 eps)

as General Edward

as Santa(1 ep)

as Self(1 ep)

as Self - Guest(1 ep)

as Marco

as Ray

as Simon

as Self(1 ep)

as Lindsay Carol(6 eps)

as Post Modern Review Staff

as Jase(6 eps)

as Self(5 eps)

as Liam

as Headmaster(6 eps)

as Self(1 ep)

as Self - Player(1 ep)

as Roy Trenneman(24 eps)

as Brendan Dowd

as Tommy O'Dwyer

as Self(1 ep)

as Self(1 ep)

as Sid's Customer

as Brendan Davenport(64 eps)

as James

as Self - Guest(1 ep)

as Bernie Maddox(12 eps)

as Guard / Contestant (voice)(1 ep)

as Butler (voice)(1 ep)

as Self(1 ep)

as Seamus (voice)(2 eps)