Part Two
Series Episode Number: 620World Premiere: Fri 9 Mar 1984 - 6:41pm GMT [BBC One] (United Kingdom)
First Broadcast: Thu 21 May 2015 - 8:30pm EDT [Retro TV]
Running Time: 25 minutes
6.60 Million (UK)
Chart Position: 75 () (UK)
Military captive Salateen tells Peri and the Doctor they are dying from spectrox toxaemia. The only cure is the milk of the queen bat who sleeps deep below the caverns.