Calificación
Reparto

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

Henry McCarthy
Dr. Beavis

Betty Bowden
Meg

Allan Mitchell
Wagstaffe

Robin Squire
Auton Scount / UNIT Driver

David Dewhurst
Private Hawkins