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!
Top Cast
Jon Pertwee as The Doctor
Roger Delgado as The Master
Katy Manning as Jo Grant
Edwin Richfield as Captain Hart
Clive Morton as Trenchard
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