The Doctor and Jo visit the Master in his high-security prison on an island off the south coast of England. The governor, Colonel Trenchard, says ships have been disappearing mysteriously at sea. The Doctor discovers that Trenchard and the Master are in league to contact the Sea Devils, a race of reptiles in hibernation in a base beneath the sea, who have been awoken by recent work on a nearby sea fort. The Master intends to use his new allies to help him conquer the world!
Cast
Jon Pertwee
The Doctor
Roger Delgado
The Master
Katy Manning
Jo Grant
Edwin Richfield
Captain Hart
Clive Morton
Trenchard
June Murphy
3rd Officer Jane Blythe
Donald Sumpter
Commander Ridgeway
David Griffin
Lt. Commander Mitchell
Hugh Futcher
Hickman
Royston Tickner
Robbins
Pat Gorman
Sea Devil
Peter Forbes-Robertson
Chief Sea Devil
Declan Mulholland
Clark
Alec Wallis
Ldg. Telegraphist Bowman
Brian Justice
Castle Guard Wilson
Terry Walsh
Castle Guard Barclay
Eric Mason
C.P.O. Smedley
Christopher Wray
Ldg. Seaman Lovell
Stanley McGeagh
Castle Guard Drew
Brian Vaughan
Lt. Commander Watts
Martin Boddey
Walker
Crew
Michael E. Briant
Director
Malcolm Hulke
Writer
Terrance Dicks
Script Editor
Martyn Day
Editor
Barry Letts
Producer
Tony Snoaden
Production Design
Peter Sargent
Camera Operator
Maggie Fletcher
Costume Design
Sylvia James
Makeup Artist
Tony Millier
Sound
Colin Dixon
Sound
Mike Jefferies
Lighting Director
Peter Day
Visual Effects
Malcolm Clarke
Original Music Composer
Brian Hodgson
Special Sound Effects
Delia Derbyshire
Theme Song Performance
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