In the distant future, the Doctor, Sarah and Harry find a space station preserving the future of mankind. But the insect Wirrn have got there first...
Tom Baker
Elisabeth Sladen
Ian Marter
Wendy Williams
Kenton Moore
Score: 7.9
Score: 8.0
Score: 7.8
Score: 7.2
Score: 7.5
Score: 7.3
Score: 7.7
Score: 6.6
