Peter Sumner

as Dr Dickenson

as Professor Ed Woodman

as Teacher (1 episode)

as Lt. Pol Treidum

as Captain Gardiner (2 episodes)

as Errol Baumann (1 episode)

as Carl Sexton (1 episode)

as Kennett (1 episode)

as Buzz

as Gorman

as Jonathan Bromley (10 episodes)

as Grant's Father

as Phil Buchanan (1 episode), as Harry Grant (1 episode)

as Cooper

as Ben Thompson

as Bill Hayden (3 episodes)

as John Meadows (2 episodes)

as Tewson

as Reg

as Dowie Steed

as Lt. Pol Treidum (uncredited)

as Sgt. McManus