Nicholas Donnelly

as Peter Melrose (1 episode)

as Police Inspector

as Doctor Bridle

as Major Crawley

as Superintendent

as Det. Sgt. Kates (1 episode)

as Inspector Adams (1 episode), as Inspector (1 episode)

as Detective

as Mr. MacKenzie (120 episodes), as Mc. MacKenzie (24 episodes)

as Chief Inspector (1 episode)

as Ivan (1 episode), as Jean (1 episode)

as Recruit (uncredited)

as Johnny Wills (288 episodes)