The Doctor
Sarah Jane Smith
Harrison Chase
Richard Dunbar
Sir Colin Thackeray
Amelia Ducat
Scorby
Arnold Keeler / Krynoid (voice)
Hargreaves
Derek Moberley
John Stevensen
Charles Winlett
Doctor Chester
Major Beresford
Sergeant Henderson
Chauffeur
Guard Leader
Guard
Sir Colin's Aide
Marine
UNIT Soldier
The Krynoid
