Roderick Smith

as Willy Urlowe ("The Contraption")

(1 episode) as John Newman

as Bob

as Marcadé

as Journalist

(3 episodes) as Donald Newman

as Detective

(62 episodes) as Sgt Keith Lardner

(1 episode) as Whiskers

as Cliffie

(1 episode) as Gary Belstead

as Hiseman

(3 episodes) as Philip Larch

(2 episodes) as Cruikshank