Episode FourSeries Episode Number: 223
World Premiere: Sat 23 Nov 1968 - 5:14pm BST [BBC One] (United Kingdom)
Running Time: 24 minutes 18 seconds
6.40 Million (UK)Appreciation Index: 51 (UK)
Chart Position: 73 () (UK)
Recorded on Fri 11 Oct 1968 in Lime Grove D
Archive State: Missing
Trapped by Vaughn's men at International Electromatics, the Doctor requests help from the Brigadier and UNIT, the United Nations Intelligence Taskforce.
A UFO is delivering cocoons to the electronics firm but what is inside them?