James Smillie

as Voice

as Duke #1

as A.K.H Boyd

as Justice Computer

as John Bowers (1 episode)

as Justice Computer (voice) (1 episode)

as Dr Dan Marshall (25 episodes)

as Mr. Pig

as Cliff Hudson

as Dr Norton (1 episode)

as Malcolm McCrae (6 episodes)

as Reardon

as Steve Wilson (79 episodes)

as Baxter (1 episode)

as Bob Malory

as Bob Malory (1 episode)

as Keith Hopkirk (1 episode)