Finbar Lynch

as FINN

as Klemens von Metternich

as Professor Greenwood

as Claudius

as Father Brendan

as Matthias

as G.D. Birkhof

as Rupert Weatherson-Wilson KC (1 episode)

as Carpenter

as Paco (1 episode)

as Dr. Martin Wells (3 episodes)

as Aidan Doyle (1 episode)

as Brown

as Vice President Robert Fleming (1 episode)

as Duke of Buckingham

as Heffernan

as Philip

as Hugh Ellyn

as Teiresias

as Doctor Boris Zarubin

as Baltasar (1 episode)

as Monty Meecher (5 episodes)

as Michaels

as Lord Marshall (1 episode)