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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