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