The Underwater Menace is the fifth serial of the fourth season in the British science fiction television series Doctor Who, which was first broadcast in four weekly parts from 14 January to 4 February 1967.
The Second Doctor and his companions, Polly, Ben and Jamie, are captured when they arrive on a deserted volcanic island by the survivors of Atlantis. Their high priest, Lolem, decides to sacrifice them to the great god Amdo.
The Doctor is given a meal, and realises that it must have been prepared by Professor Zaroff, a missing scientist who was presumed dead. The Doctor sends Zaroff a note and Zaroff comes to their rescue.
Polly is taken by Damon for conversion-surgery into a Fish Person, while Ben and Jamie are taken to work in a mine. The Doctor cuts off the power, which gives Polly time to escape and hide in the Temple of Amdo. Zaroff tells the Doctor that he plans to drain the sea so Atlantis could come back to the surface. The Doctor realises this will destroy Earth and escapes to find a solution and look for his companions.
Ben and Jamie, along with two shipwrecked sailors, Sean and Jacko, discover Polly’s hiding place. The Doctor finds a priest named Ramo along the way and tells him Zaroff’s plans. Ramo takes the Doctor to Thous, King of Atlantis, who sides with Zaroff.
The Doctor and the priest are taken to be sacrificed to Lolem at the temple of Amdo. They are saved by Ben faking the voice of the statue of Amdo and giving them a chance to escape. The Doctor kidnaps Zaroff and takes him to the temple of Amdo where Ramo and Polly are left as his guards. Zaroff then fakes a seizure, stabs Ramo, and takes Polly as a hostage.
Ramo survives and goes to warn the Doctor, which gives Jamie, Sean, and Jacko the chance to rescue Polly. Zaroff escapes and goes straight to Thous. Thous begins to worry about the strike amongst the Fish People and realises Zaroff is mad. He immediately orders him to stop his plans, but this angers Zaroff, who shoots Thous and his royal protectors.
With Zaroff out of sight, the Doctor finds Thous bleeding but alive and takes him to the temple of Amdo for safety. He plans to stop Zaroff by sinking Atlantis even further so the reactor and Zaroff’s laboratory could be destroyed.
The Doctor and Ben cause a radiation leak to put their plan in action while Sean and Jacko warn the Atlanteans to get to higher level. The walls of Atlantis start to crumble but Polly and Jamie find a way out to the surface. When the Doctor and Ben find Zaroff, he is determined to not let anything stop him, even the flooding. They trick Zaroff and lock him out of his laboratory just in time but he won’t give up which results in his death by drowning.
The Doctor and Ben make their way towards the surface where they reunite with Jamie and Polly. Knowing many will have survived the crisis, the Doctor and his companions flee in the TARDIS.
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To view the list of other Doctor Who serials, please click this link
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