Episode Five
Series Episode Number: 303World Premiere: Sat 19 Jun 1971 - 6:10pm BST [BBC One] (United Kingdom)
Running Time: 24 minutes 4 seconds
8.30 Million (UK)
Chart Position: 17 () (UK)
Recorded on Wed 26 May 1971 in Television Centre 3
Archive State: PAL Restor
UNIT have penetrated the heat barrier and launch an attack on the gargoyle, Bok. In the cavern, the Daemon Azal confronts the Doctor and the Master to decide the fate of mankind.