출연진
Tom Baker
The Doctor
Elisabeth Sladen
Sarah Jane Smith
Tony Beckley
Harrison Chase
Kenneth Gilbert
Richard Dunbar
Michael Barrington
Sir Colin Thackeray
Sylvia Coleridge
Amelia Ducat
John Challis
Scorby
Mark Jones
Arnold Keeler / Krynoid (voice)
Seymour Green
Hargreaves
Michael McStay
Derek Moberley
Hubert Rees
John Stevensen
John Gleeson
Charles Winlett
Ian Fairbairn
Doctor Chester
John Acheson
Major Beresford
Ray Barron
Sergeant Henderson
Alan Chuntz
Chauffeur
David Masterman
Guard Leader
Harry Fielder
Guard
Pat Gorman
Guard
Ian Elliott
Guard
Keith Ashley
Sir Colin's Aide