Episode ThreeSeries Episode Number: 222
World Premiere: Sat 16 Nov 1968 - 5:15pm BST [BBC One] (United Kingdom)
Running Time: 23 minutes 44 seconds
7.10 Million (UK)Appreciation Index: 54 (UK)
Chart Position: 66 () (UK)
Recorded on Fri 04 Oct 1968 in Lime Grove D
Archive State: 16mm t/r
The Doctor and Jamie are taken prisoner by Tobias Vaughn who denies abducting Zoe and Isobel. The Doctor suspects that there may be an even greater threat behind Vaughn.