Peter Davison
The Doctor
Matthew Waterhouse
Adric
Janet Fielding
Tegan
Sarah Sutton
Nyssa
James Warwick
Scott
Clare Clifford
Kyle
Beryl Reid
Briggs
J
June Bland
Berger
S
Steve Morley
Walters
S
Suzi Arden
Snyder
A
Ann Holloway
Mitchell
A
Anne Clements
Trooper
Mark Straker
Trooper
A
Alec Sabin
Ringway
Mark Fletcher
Crewmember
C
Christopher Whittingham
Crewmember
David Banks
Cyber Leader
M
Mark Hardy
Cyber Lieutenant
William Hartnell
The Doctor (1) (archive footage)
Patrick Troughton
The Doctor (2) (archive footage)
Tom Baker
The Doctor (4) (archive footage)