Doctor Who: The Underwater Menace (Blu-ray)

The Doctor and his friends find themselves in the lost city of Atlantis, where the crazed Professor Zaroff has convinced the people of Atlantis that he can raise their sunken city from beneath the sea. However, the Doctor discovers a terrible secret behind Zaroff's plan - a secret that could destroy all life on Earth. As the countdown commences to the end of the world, can the Doctor defeat the underwater menace?