출연진
Jon Pertwee
The Doctor
Caroline John
Liz Shaw
Nicholas Courtney
Brigadier Lethbridge-Stewart
Ronald Allen
Ralph Cornish
John Abineri
Carrington
Robert Cawdron
Taltalian
Michael Wisher
John Wakefield
Cheryl Molineaux
Miss Rutherford
Ray Armstrong
Grey
Robert Robertson
Collinson
Ric Felgate
Van Lyden / Alien Ambassador
Dallas Cavell
Quinlan
Bernard Martin
Control Room Assistant
John Moreno
Dobson
James Haswell
Corporal Champion
Derek Ware
UNIT Sergeant
William Dysart
Reegan
Cyril Shaps
Lennox
Gordon Sterne
Heldorf
Steve Peters
Alien Ambassador / Lefee
Neville Simons
Alien Ambassador / Michaels