Doctor Who: The Abominable Snowmen

Her final battle. Her deadliest enemies. The Thirteenth Doctor faces multiple threats from Daleks, Cybermen and the Master, in a fight for her very existence. 

Jamie and Victoria manage to escape from the cave where the yeti attacked them. The Doctor discovers a cavity in the chest of a yeti. These are not real Yeti, but robots. Meanwhile, in and around the Monastery, gleaming silver spheres begin to move, emitting high-pitched beeping sounds.

When a Yeti is captured by the Detsen monks, the Doctor discovers that it is a robot - but its control sphere is missing. Elsewhere in the monastery, the sphere is on the move.

Imprisoned in the monastery, Victoria plans her escape. Meanwhile, the old High Lama is in the control of the alien Great Intelligence which plans to invade the Earth.

Discovering that his old friend, Padmasambhava is still alive after three hundred years, the Doctor goes to confront him. The Great Intelligence prepares to make its final move.

As the Great Intelligence manifests itself on Earth, the Doctor makes a last, desperate attempt to repel the evil entity by pitting his mind against it in a mental battle.