Jon Pertwee
The Doctor
Acting
Katy Manning
Jo Grant
Acting
Nicholas Courtney
Brigadier Lethbridge-Stewart
Acting
John Levene
Sergeant Benton
Acting
Richard Franklin
Captain Mike Yates
Acting
Stewart Bevan
Cliff Jones
Acting
Jerome Willis
Stevens
Acting
Tony Adams
Elgin
Acting
Ben Howard
Hinks
Acting
Mostyn Evans
Dai Evans
Acting
Talfryn Thomas
Dave
Acting
Roy Evans
Bert
Acting
Mitzi McKenzie
Nancy
Acting
Ray Handy
Milkman
Acting
John Scott Martin
Hughes
Acting
John Rolfe
Fell
Acting
John Dearth
BOSS (voice)
Acting
Richard Beale
Minister of Ecology
Acting
Jean Burgess
Cleaner
Acting
Brian Justice
Yates' Guard
Acting
Terry Walsh
Guard
Acting
Roy Skelton
James
Acting