Last updated 24 March 2024

Episode 3

Series Episode Number: 159

World Premiere: Sat 22 Apr 1967 - 5:50pm BST [BBC One] (United Kingdom)
Running Time: 23 minutes 10 seconds

7.90 Million (UK)

Appreciation Index: 53 (UK)

Chart Position: 43 () (UK)

Recorded on Tue 18 Apr 1967 in Lime Grove D
Archive State: 16mm t/r

With the support of Inspector Crossland, the Doctor pursues his investigations. But the Chameleons have already taken steps to prevent the Doctor from uncovering the truth.