Walter Paxton (7 episodes)

Tall Hunter

O'Malley

Leon

John Flynn

Hugh

Gil Loescher

The Bone Collector (10 episodes)

Basil (4 episodes)

Auggie (10 episodes)

Frank McAlpine (8 episodes)

Steve Jones (4 episodes)

Ken Karn (13 episodes)

Mayakovsky (3 episodes)

John Billington (2 episodes)

Baron Ventris (1 episode)

Sean Ramsey (8 episodes)

RSM Digby

Commander O'Keefe

Inpector Mick Moynihan (12 episodes)

Ennis

Edwin Lily

Reg Duffy (13 episodes)

Bert Pierce (5 episodes)

Det. Ronny Rosario

Aaron Stark (22 episodes)

The Consultant

Colin (1 episode)

Bobby Lasorda

Sean

Alexander Hamilton (1 episode)

Dr. Sweet

Lewes

Liam Connors (1 episode)

Father Horvak

Larry (1 episode)

Larry

Mick McCabe

Mick

Richie Markey

Darill Miller

Gerry

Interrogator

Padraic Connelly (1 episode)

George

Luke (4 episodes)

Timmy

Jessop