Part OneSeries Episode Number: 406
World Premiere: Sat 27 Sep 1975 - 5:45pm BST [BBC One] (United Kingdom)
First Broadcast: Mon 31 Mar 1980 - 5:30pm CST [WTTW 11 Chicago]
Running Time: 24 minutes 2 seconds
10.40 Million (UK)Appreciation Index: 56 (UK)
Chart Position: 19 () (UK)
Recorded on Mon 30 Jun 1975 in TC6
The TARDIS takes the Doctor and Sarah to the planet Zeta Minor on the edge of the universe. An unseen menace has wiped out a Morestran expedition and haunts the alien jungle...