Cast
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