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
M
Mostyn Evans
Dai Evans
T
Talfryn Thomas
Dave
R
Roy Evans
Bert
M
Mitzi McKenzie
Nancy
R
Ray Handy
Milkman
J
John Scott Martin
Hughes
J
John Rolfe
Fell
John Dearth
BOSS (voice)
R
Richard Beale
Minister of Ecology
J
Jean Burgess
Cleaner
B
Brian Justice
Yates' Guard
Terry Walsh
Guard
Roy Skelton
James