Jon Pertwee
The Doctor
Katy Manning
Jo Grant
Roger Delgado
The Master
Edwin Richfield
Captain Hart
Clive Morton
Trenchard
June Murphy
3rd Officer Jane Blythe
Alec Wallis
Ldg. Telegraphist Bowman
Pat Gorman
Sea Devil
Donald Sumpter
Commander Ridgeway
David Griffin
Lt. Commander Mitchell
Stanley McGeagh
Castle Guard Drew
Colin Bell
C.P.O. Summers
Brian Vaughan
Lt. Commander Watts
Terry Walsh
Castle Guard Barclay (uncredited)
Tony Snoaden
Production Design
Michael E. Briant
Director
Martyn Day
Editor
Malcolm Clarke
Original Music Composer
Peter Day
Visual Effects
Malcolm Hulke
Writer
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