Cast
Tom Baker
The Doctor
Elisabeth Sladen
Sarah Jane Smith
Tony Beckley
Harrison Chase
K
Kenneth Gilbert
Richard Dunbar
M
Michael Barrington
Sir Colin Thackeray
S
Sylvia Coleridge
Amelia Ducat
John Challis
Scorby
Mark Jones
Arnold Keeler / Krynoid (voice)
S
Seymour Green
Hargreaves
M
Michael McStay
Derek Moberley
H
Hubert Rees
John Stevensen
J
John Gleeson
Charles Winlett
I
Ian Fairbairn
Doctor Chester
J
John Acheson
Major Beresford
R
Ray Barron
Sergeant Henderson
