The Sea Devils is the third serial of the ninth season of the long-running British science fiction television series Doctor Who, which was first broadcast in six weekly parts on BBC1 from 26 February to 1 April 1972.
The Third Doctor and Jo visit the Master, imprisoned on a small island in the English Channel. Despite his claim to have reformed, he refuses to reveal the location of his TARDIS. As they depart, the Doctor hears of ships mysteriously disappearing. Curious, he investigates a sea fortress, where he and Jo are attacked by a sea-adapted bipedal reptile, called a Sea Devil by one witness. They escape to a nearby naval base.
The Doctor discovers that the Master, with the misguided aid of his ostensible jailor Colonel Trenchard, is stealing electrical equipment from the naval base to build a machine that will control the so-called Sea Devils, intending to use them as an army through which to conquer the world.
He summons them and they begin to emerge from the sea. A battle for the prison ensues during which Trenchard is killed. The Doctor and Jo once again flee to the naval base where Captain Hart tells them a submarine has disappeared. Whilst the crew prepare for battle, the Doctor is seized by the sea creatures.
The Doctor offers to broker peaceful negotiations between the sea-creatures and the humans, recalling how he failed in his earlier attempt with the Silurians. Matters are left unresolved in the wake of an attack by depth charges ordered by Robert Walker, a British politician arrived to take control of the situation and intent on repeating UNIT’s actions against the Silurians, namely blowing them up, but this time with a nuclear weapon.
The attack is opposed by Jo, but does provide the Doctor with cover as he flees to the naval base, where he persuades Walker to allow him another, final attempt at negotiation. In the meantime the Sea Devils capture the naval base, a move instigated by the Master. As part of his plan, he now forces the Doctor to help build a machine to revive dormant Sea Devils around the world.
The device activated, the Sea Devils imprison them both, their uses ended, but the Doctor has sabotaged the machine. He escapes with the Master using equipment from the captured submarine.
The sabotaged machine destroys the Sea Devil base before a military attack can begin. The Master evades capture by faking a heart attack and then hijacking a rescue hovercraft.
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To view the list of other Doctor Who serials, please click this link
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