导演 Douglas Camfield

The Doctor Tom Baker

Sarah Jane Smith 伊丽莎白·斯莱登

Harrison Chase Tony Beckley

Richard Dunbar Kenneth Gilbert

Sir Colin Thackeray Michael Barrington

Amelia Ducat Sylvia Coleridge

Scorby John Challis

Arnold Keeler / Krynoid (voice) Mark Jones

Hargreaves Seymour Green

Derek Moberley Michael McStay

John Stevensen Hubert Rees

Charles Winlett John Gleeson

Doctor Chester Ian Fairbairn

Major Beresford John Acheson

Sergeant Henderson Ray Barron

Chauffeur Alan Chuntz

Guard Leader David Masterman

Guard Harry Fielder

Guard Pat Gorman

Guard Ian Elliott

Marine Patrick Milner

UNIT Soldier Barry Summerford

UNIT Soldier Tony Snell

UNIT Soldier Patrick Ginter

UNIT Soldier Rowland Geall

UNIT Soldier Derek Wayland

Sir Colin's Aide Keith Ashley

Marine Ronald Gough