Episode SixSeries Episode Number: 243
World Premiere: Sat 12 Apr 1969 - 5:14pm BST [BBC One] (United Kingdom)
Running Time: 24 minutes 26 seconds
5.30 Million (UK)Appreciation Index: 52 (UK)
Chart Position: 98 () (UK)
Recorded on Fri 28 Mar 1969 in Lime Grove D
Archive State: Missing
Onboard the rickety LIZ 79, Milo Clancey and Dom Issigri fall unconscious when Caven switches off the oxygen supply. Caven makes his getaway as the Doctor races to defuse a bomb.