Calificación
Reparto

Peter Davison
The Doctor

Sarah Sutton
Nyssa

Janet Fielding
Tegan Jovanka

Anthony Ainley
The Master / Kalid

Nigel Stock
Professor Hayter

Richard Easton
Captain Stapley

Keith Drinkel
Flight Engineer Scobie

Michael Cashman
First Officer Bilton

John Flint
Captain Urquhart

Judith Byfield
Angela Clifford

Peter Dahlsen
Horton

Brian McDermott
Sheard

Peter Cellier
Andrews

Matthew Waterhouse
Adric

Hugh Hayes
Anithon

André Winterton
Zarak