Part OneSeries Episode Number: 572
World Premiere: Mon 8 Mar 1982 - 6:56pm GMT [BBC One: Not Wales] (United Kingdom)
First Broadcast: Sun 29 May 1983 - 11:00pm CDT [WTTW 11 Chicago]
Running Time: 24 minutes 22 seconds
9.10 Million (UK)
Chart Position: 45 () (UK)
Recorded on Tue 10 Nov 1981 in Television Centre 8
Deadly androids are protecting a bomb buried beneath the Earth from all investigation. However, the Doctor manages to disable it, alerting its owners � the Cybermen...