Episode FiveSeries Episode Number: 224
World Premiere: Sat 30 Nov 1968 - 5:15pm BST [BBC One] (United Kingdom)
Running Time: 23 minutes 25 seconds
6.70 Million (UK)Appreciation Index: 52 (UK)
Chart Position: 67 () (UK)
Recorded on Fri 18 Oct 1968 in Lime Grove D
Archive State: 16mm t/r
The Doctor discovers that the Cybermen are planning to immobilise Earth's population by transmitting a hypnotic signal broadcast through International Electromatics products.