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
The Doctor
Katy Manning
Jo Grant
Nicholas Courtney
Brigadier Lethbridge-Stewart
John Levene
Sergeant Benton
Richard Franklin
Captain Mike Yates
Stewart Bevan
Cliff Jones
Jerome Willis
Stevens
Tony Adams
Elgin
Ben Howard
Hinks
Mostyn Evans
Dai Evans
Talfryn Thomas
Dave
Roy Evans
Bert
Mitzi McKenzie
Nancy
Ray Handy
Milkman
John Scott Martin
Hughes
John Rolfe
Fell
John Dearth
BOSS (voice)
Richard Beale
Minister of Ecology
Jean Burgess
Cleaner
Brian Justice
Yates' Guard
Terry Walsh
Guard
Roy Skelton
James
Michael E. Briant
Director
Robert Sloman
Writer
Barry Letts
Producer
Feb 16, 1962
Mar 16, 1982
Dec 7, 1988
Sep 7, 1968
Oct 12, 1968
Jul 26, 2001
Jun 1, 1968
Nov 16, 1988
Aug 23, 2014
Sep 20, 2024
Jan 11, 1992
Feb 9, 2007
Oct 5, 2023
Aug 17, 2022
Dec 25, 2014
Feb 5, 2014
BBC
GB
United Kingdom
English
