Last updated 24 March 2024


Episode Six

Series Episode Number: 179

World Premiere: Sat 4 Nov 1967 - 5:25pm GMT [BBC One] (United Kingdom)
Running Time: 23 minutes 51 seconds

7.40 Million (UK)

Appreciation Index: 52 (UK)

Chart Position: 56 () (UK)

Recorded on Sat 14 Oct 1967 in Lime Grove D
Archive State: Missing



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.