Part OneSeries Episode Number: 496
World Premiere: Sat 23 Dec 1978 - 6:17pm GMT [BBC One] (United Kingdom)
First Broadcast: Sun 20 Sep 1981 - 11:00pm CDT [WTTW 11 Chicago]
Running Time: 23 minutes 16 seconds
6.50 Million (UK)
Chart Position: 85 () (UK)
Recorded on Mon 09 Oct 1978 in Television Centre 6
Tracing the fifth segment of the Key to Time to the third moon of Delta Magna, the Doctor and Romana are soon caught up in the conflict between humans and the Swampies.