Last updated 24 March 2024

Part One

Series Episode Number: 366

World Premiere: Sat 23 Feb 1974 - 5:29pm GMT [BBC One] (United Kingdom)
First Broadcast: Sun 9 Oct 1983 - 11:00pm CDT [WTTW 11 Chicago]
Running Time: 24 minutes 32 seconds

8.10 Million (UK)

Appreciation Index: 61 (UK)

Chart Position: 49 () (UK)

Recorded on Tue 04 Dec 1973 in TC3
Archive State: PAL 2 VT


The TARDIS suffers a power drain and is forced down on the planet Exxilon. Sarah is captured by the primitive inhabitants and the Doctor comes face to face with his oldest enemies.