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Jon Pertwee
The Doctor

Caroline John
Liz Shaw

Nicholas Courtney
Brigadier Lethbridge-Stewart

Hugh Burden
Channing

Hamilton Dyce
Major General Scobie

Antony Webb
Dr. Henderson

Neil Wilson
Seeley

Talfryn Thomas
Mullins

John Breslin
Captain Munro

John Woodnutt
Hibbert

Derek Smee
Ransome