On screen
Cast
21 credited performers
Jon Pertwee
The Doctor
Roger Delgado
The Master
Katy Manning
Jo Grant
Edwin Richfield
Captain Hart
Clive Morton
Trenchard
Artwork unavailable
June Murphy
3rd Officer Jane Blythe
Donald Sumpter
Commander Ridgeway
David Griffin
Lt. Commander Mitchell
Artwork unavailable
Hugh Futcher
Hickman
Royston Tickner
Robbins
Artwork unavailable
Pat Gorman
Sea Devil
Peter Forbes-Robertson
Chief Sea Devil
Artwork unavailable
Declan Mulholland
Clark
Artwork unavailable
Alec Wallis
Ldg. Telegraphist Bowman
Artwork unavailable
Brian Justice
Castle Guard Wilson
Terry Walsh
Castle Guard Barclay
Artwork unavailable
Eric Mason
C.P.O. Smedley
Artwork unavailable
Christopher Wray
Ldg. Seaman Lovell
Artwork unavailable
Stanley McGeagh
Castle Guard Drew
Artwork unavailable
Brian Vaughan
Lt. Commander Watts
Martin Boddey
Walker