Classic Who S9 • Serial 3 · (6 episodes)
The Sea Devils
Other variations of this story: The Sea Devils (BBC Audio Soundtrack)
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.
6 Episodes:
The Doctor and Jo visit the Master at his island prison where the Doctor becomes curious about a number of ships sinking in the area.
The Doctor and Jo are trapped on the fort by a Sea Devil while the Master convinces Trenchard to help him steal some electronic components.
The Doctor is held prisoner by Trenchard while the Master attempts to contact the Sea Devils.
The Sea Devils attack the island prison and rescue the Master, prompting the Doctor to venture underwater to try and contact them.
The Doctor is taken to the Sea Devils' underwater colony where he tries to make peace with the creatures, only for the navy to attack the base.
The Sea Devils take over the naval base and the Doctor is forced to help the Master find a way to revive their colony.