Ian Bannen

as Matt Moss (Crossing the Line) (archive footage)

as Billy

as Sir Matt Busby

as Terence Adamson

as Jackie O'Shea

as Don Pozzi

as Gabriel Dauntsey (3 episodes)

as Robert Bruce Sr.

as Sir Donald Frazier (3 episodes)

as Grandpa

as Provost

as Melville

as Dr. Alexander Cameron (27 episodes)

as Edward Lloyd

as David Lloyd George

as Prof. Serebryakov

as Serebryakov (1 episode), as Provost (1 episode)

as Mattie Muldoon

as Canon Loftus (3 episodes)

as Luzifer

as Matt Mason

as Sir Edith Moser