Last updated 24 March 2024


Part Four

Series Episode Number: 359

World Premiere: Sat 5 Jan 1974 - 5:29pm GMT [BBC One] (United Kingdom)
First Broadcast: Thu 27 Nov 2014 - 8:30pm EST [Retro TV]
Running Time: 24 minutes 57 seconds

10.60 Million (UK)

Appreciation Index: 60 (UK)

Chart Position: 22 () (UK)

Recorded on Tue 12 Jun 1973 in TC1
Archive State: PAL 2 VT



As the repairs to Linx's spaceship are completed and he prepares to take off, the Doctor races to save the captured scientists and to prevent the course of history being changed.