The Face of Evil is the fourth serial of the 14th season of the British science fiction television series Doctor Who, which was first broadcast in four weekly parts on BBC1 from 1 to 22 January 1977.
The Fourth Doctor, travelling alone in the TARDIS, arrives on a jungle planet and encounters Leela, a savage from the local tribe, who denounces him as the Evil One of fable among her people. She has been exiled from her tribe, the Sevateem, for profaning their god Xoanon who is kept prisoner by the Evil One and his followers, the Tesh, beyond a black wall.
He speaks to them through the tribe’s shaman, Neeva. The Doctor finds a sophisticated sonic disruptor, which creates the force field that keeps creatures from attacking the village. The Sevateem will launch an attack on the domain of the Tesh to free their god, led by the combative Andor who suspects Neeva of being a false prophet.
In Neeva’s holy tent, the Doctor inspects the ancient tribal relics, artifacts from an Earth survey expedition. He finds a transceiver used by Neeva to hear the commands of Xoanon. It speaks with the Doctor’s own voice, conveying exhilaration on hearing the Doctor that “At last we are here. At last I shall be free of us.” The Doctor tells some of the tribe the Sevateem are the descendants of a “survey team” which left a Starfall Seven Earth colony ship.
The Doctor and Leela arrive at a clearing beyond which, carved into a mountain nearby, is a depiction of the Doctor’s face. The Doctor cannot recall why his likeness would be there. They notice a figure in a space suit in the “mouth” entrance and follow it through a projection of a wall. Beyond is a rocket, which the Doctor recalls as belonging to the Mordee Expedition, his memory of earlier events now returning.
Xoanon has detected the Doctor nearby, and when he reaches the ship the god-creature is both ecstatic that “We are here” while also manically pledging that “We must destroy us.” The Doctor and Leela meet three representatives of the Tesh, who serve and worship Xoanon. The Doctor deduces both Sevateem and Tesh are descendants of the same crew from the Mordee Expedition, with the Tesh (or technicians) involved in the same deadly eugenics exercise as the Sevateem (or survey team).
The invisible creatures that attacked the Sevateem are part of the same deranged scheme: Xoanon is a computer, designed to think independently. The Doctor had once repaired Xoanon but forgot to wipe his personality print from the data core, leaving the computer with a split personality. The Doctor, speaking as Xoanon with the communicator, instructs Neeva to tell Calib, who is now tribal leader, to lead the Sevateem survivors through the face in the mountain.
With Leela keeping guard and holding the Tesh at bay, the Doctor ventures into the computer room of the ship to confront Xoanon. When Xoanon refuses to shut itself down, it channels a vicious mental assault at the Doctor, causing him to collapse, while Xoanon booms: “Who am I?”
The Tesh come under attack from Calib, Tomas and the survivors of the Sevateem, who now reach the spaceship. This diverts the Tesh while the Doctor and Leela return to the computer room, where Xoanon briefly takes control of Leela’s mind. Most of the Sevateem come under the telepathic control of the computer too. The Tesh and Sevateem converge on the computer room and interrupt the Doctor as he tries to repair Xoanon, realising the computer has now triggered the countdown to an atomic explosion.
Elsewhere in the ship Neeva is alone but crazed, his faith in Xoanon shattered. The shaman uses the disruptor gun against one of the images of Xoanon/the Doctor projected through a wall. The ensuing blast kills Neeva but also interrupts Xoanon’s control of its subjects, allowing the Doctor to resume and complete his repairs. Xoanon’s circuits explode, knocking the Doctor out.
Two days later the Doctor wakes up to find himself aboard the spaceship in the care of Leela. She explains Xoanon has been quiet and he interprets this as success for his extraction experiment. They visit the computer room and find Xoanon’s identity and sanity restored.
The computer confirms it was running a eugenics experiment and thanks the Doctor for his repair work. The Doctor then contacts the survivors of the Tesh and Sevateem and tells them Xoanon is now cured and able to support their new society. Leela then jumps aboard the TARDIS despite the protests of the Doctor, initiating take-off.
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