The Doctor and UNIT investigate a deadly infection lurking underneath the Welsh mining town of Llanfairfach. It's an adventure that will change Jo Grant's life forever...
Jon Pertwee
Katy Manning
Nicholas Courtney
John Levene
Richard Franklin
Score: 8.1
Score: 6.2
Score: 7.5
Score: 7.3
Score: 7.7
Score: 7.3
Score: 6.3
Score: 5.4
