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Jon Pertwee
The Doctor

Elisabeth Sladen
Sarah Jane Smith

Nicholas Courtney
Brigadier Lethbridge-Stewart

Richard Franklin
Mike Yates

John Levene
Sergeant Benton

Noel Johnson
Sir Charles Grover

Peter Miles
Professor Whittaker

Martin Jarvis
Butler

John Bennett
General Finch

Terence Wilton
Mark

Carmen Silvera
Ruth

Brian Badcoe
Adam

Ben Aris
Lieutenant Shears

Dave Carter
Sgt. Duffy

Martin Taylor
Corporal Norton

George Bryson
Private Ogden