Tom Baker

The Doctor

Elisabeth Sladen

Sarah Jane Smith

Tony Beckley

Harrison Chase

Kenneth Gilbert

Richard Dunbar

Michael Barrington

Sir Colin Thackeray

Sylvia Coleridge

Amelia Ducat

John Challis

Scorby

Mark Jones

Arnold Keeler / Krynoid (voice)

Seymour Green

Hargreaves

Michael McStay

Derek Moberley

Hubert Rees

John Stevensen

John Gleeson

Charles Winlett

Ian Fairbairn

Doctor Chester

John Acheson

Major Beresford

Ray Barron

Sergeant Henderson

Douglas Camfield