“The Underwater Menace” is an adventure of the fourth season of “Doctor Who” classic series, which aired in 1967. It’s a four parts adventure written by Geoffrey Orme and directed by Julia Smith.
The Tardis materializes on Earth and the Second Doctor (Patrick Troughton), Jamie (Frazer Hines), Ben (Michael Craze) and Polly (Anneke Wills) go out to explore what looks like a deserted volcanic island. However, the nearby caves are inhabited and the travelers are immediately captured.
The local inhabitants are the survivors of Atlantis and their high priest decides to sacrifice the travelers to their god Amdo. They receive one last meal but the Doctor realizes that it must have been prepared by Professor Zaroff, a scientist whose traces were lost. In fact, Zaroff is working on a plan that can have terrible consequences for the whole world.