Last updated 24 March 2024


Part Four

Series Episode Number: 561

World Premiere: Tue 26 Jan 1982 - 7:06pm GMT [BBC One: Not Wales] (United Kingdom)
First Broadcast: Mon 13 Apr 2015 - 8:30pm EDT [Retro TV]
Running Time: 24 minutes 53 seconds

9.40 Million (UK)


Chart Position: 53 () (UK)

Recorded on Wed 29 Apr 1981 in Television Centre 6



The Doctor takes a dangerous spacewalk to rescue Tegan while Nyssa and Bigon keep the Urbankans distracted. Adric decides exactly whose side he is on