Joseph Blatchley

as Professor Scheerding

as Martin Baker

as Registrar

as Mordred

as George

as Albert

as Patia Trofimov

as Paul

as David Armstrong

as Joe Ackerley

as Robert

as Carlton

as Lachlan MacMartin (6 episodes)

as Mr. Whistler

as Godfrey Chart (1 episode)

as Joe Nantwich

as Paul (1 episode)

as Peter

as Ludo Myers

as Carlton (1 episode)

as Freddy

as Grant Edgeworth (1 episode)

as Peter (1 episode), as David Armstrong (1 episode)

as Philip Welch (1 episode)