The Sea Devils

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 reptilian race in hibernation beneath the sea, who have been awoken by recent work on a sea fort. The Master intends to use his new allies to help him conquer the world.

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