Part FourSeries Episode Number: 401
World Premiere: Sat 10 May 1975 - 6:30pm BST [BBC One] (United Kingdom)
First Broadcast: Mon 24 Mar 1980 - 5:30pm CST [WTTW 11 Chicago]
Running Time: 23 minutes 21 seconds
9.40 Million (UK)Appreciation Index: 58 (UK)
Chart Position: 22 () (UK)
Recorded on Tue 17 Dec 1974 in TC3
Their plan to blow up Voga thwarted, the Cybermen intend to crash Nerva into it. Vorus is almost ready to launch his rocket at Nerva, but Sarah is still trapped on board.