Ηθοποιοί επεισοδίου
Jon PertweeThe Doctor
Nicholas CourtneyThe Brigadier
Caroline JohnLiz Shaw
Ronald AllenRalph Cornish
William DysartReegan
★
Ric FelgateVan Lyden
★
Joanna RossControl Room Assistant
★
Carl ConwayControl Room Assistant
★
Peter Noel CookAlien Space Captain
★
Steve PetersLefee
★
Neville SimonsMichaels
Peter HallidayAliens (voice)
John AbineriGeneral Carrington
Max FaulknerUNIT Soldier (uncredited)