Last updated 18 August 2023


Part Five

Series Episode Number: 504

World Premiere: Sat 17 Feb 1979 - 6:26pm GMT [BBC One] (United Kingdom)
First Broadcast: Fri 25 May 2001 - 10:30pm CDT [Prairie Public Television]
Running Time: 24 minutes 42 seconds

8.60 Million (UK)


Chart Position: 66 () (UK)

Recorded on Sun 03 Dec 1978 in Television Centre 3



The Doctor and Romana arrive in the lair of the Shadow, servant of the Black Guardian, who also seeks the Key to Time.