★ 6.3
★ 7.3
★ 6.1
★ 6.7
★ 10.0
★ 6.0
★ 7.1
★ 7.6
★ 7.4
★ 5.5
★ 0.0
★ 5.9
★ 6.8
★ 3.4
★ 5.0
★ 5.6
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...
