Jon Pertwee

The Doctor

Katy Manning

Jo Grant

Nicholas Courtney

Brigadier Lethbridge-Stewart

Richard Franklin

Captain Mike Yates

John Levene

Sergeant Benton

Roger Delgado

The Master

Pik-Sen Lim

Captain Chin Lee

Raymond Westwell

Prison Governor

Michael Sheard

Dr. Roland Summers

Simon Lack

Professor Kettering

Fernanda Marlowe

Corporal Bell

Neil McCarthy

George Patrick Barnham

Clive Scott

Arthur Linwood

Roy Purcell

Chief Prison Officer Powers

Eric Mason

Senior Prison Officer Green

Timothy Combe