The TARDIS arrives on an extinct volcanic island, and after being captured and taken into the depths of the Earth, the Doctor and his companions find the lost city of Atlantis and it’s civilians. A deranged scientist, Professor Zaroff has convinced them that he can raise the city from the sea, but in actuality, he plans to drain the ocean into the molten core at the Earth’s centre, which will result in the explosion of the planet.

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