Episode 6Series Episode Number: 209
World Premiere: Sat 1 Jun 1968 - 6:06pm BST [BBC One] (United Kingdom)
Running Time: 23 minutes 10 seconds
6.50 Million (UK)Appreciation Index: 62 (UK)
Chart Position: 51 () (UK)
Recorded on Fri 10 May 1968 in Riverside 1
Archive State: 35mm t/r
The Doctor and the crew of the Wheel battle valiantly against the invading Cybermen, but to defeat the approaching fleet of Cyber ships, the Doctor needs a vital component from the TARDIS.