On screen
Cast
13 credited performers
Frank Middlemass
Dr. Sunderland
Artwork unavailable
Oliver Hicks
John Owen
Jack May
Mr. Ardent - the Headmaster
Milo Twomey
Trevitihic
Artwork unavailable
Rory Macfarquhar
Iddingley
Artwork unavailable
Peter Cosmetatos
Madington
Artwork unavailable
James Mills
Dubnet
Artwork unavailable
Petra Davies
Mrs. Owen
Artwork unavailable
Hugh Hastings
Turle
Artwork unavailable
Charles Lewsen
Mr. Sutton
Artwork unavailable
Douglas Storm
Bishop
Artwork unavailable
Oswin Baker
Character not listed
Michael Hobbs
Character not listed