Part OneSeries Episode Number: 444
World Premiere: Sat 29 Jan 1977 - 6:20pm GMT [BBC One] (United Kingdom)
First Broadcast: Tue 27 May 1980 - 5:30pm CDT [WTTW 11 Chicago]
Running Time: 24 minutes 6 seconds
12.10 Million (UK)Appreciation Index: 62 (UK)
Chart Position: 14 () (UK)
Recorded on Tue 23 Nov 1976 in TC1
The TARDIS takes the Doctor and Leela to a huge sandminer on an alien world. One of the crew is killed and the murderer may not be human.