The Doctor and Jo encounter an ancient race of amphibious creatures off the South Coast of England, and soon learn of their plans to seize Earth for themselves – in collaboration with the Master.
The Doctor and Jo visit the Master who is held prisoner on an island.
The Doctor is eager to make peace between the Sea Devils and the humans.
Jo attempts to rescue the Doctor who is being held prisoner by the Master and Trenchard.
The Doctor attempts to persuade Captain Hart of the danger that the Master represents.
The Doctor is captured by the Sea Devils and taken to their undersea base.
The Sea Devils come to the surface and attack the Naval base.
Third Doctor
Jon Pertwee
The Master
Roger Delgado
Jo Grant
Katy Manning
Captain Hart
Edwin Richfield
Trenchard
Clive Morton
Robbins
Royston Tickner
Radio Operator
Neil Seiler
Clark
Declan Mulholland
Hickman
Hugh Futcher
3rd Officer Jane Blythe
June Murphy
Ldg. Telegraphist Bowman
Alec Wallis
Castle Guard Wilson
Brian Justice
Castle Guard Barclay
Terry Walsh
Sea Devil
Pat Gorman
C.P.O. Smedley
Eric Mason
Castle Guard Drew
Stanley McGeagh
Commander Ridgeway
Donald Sumpter
Lt. Commander Mitchell
David Griffin
Ldg. Seaman Lovell
Christopher Wray
C.P.O. Summers
Colin Bell
Lt. Commander Watts
Brian Vaughan
A/B Girton
Rex Rowland
Walker
Martin Boddey
Rear Admiral
Norman Atkyns
Chief Sea Devil
Peter Forbes-Robertson
C.P.O. Myers
John Caesar
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