Calificación
Reparto

Jon Pertwee
The Doctor

Katy Manning
Jo Grant

Roger Delgado
The Master

Vera Fusek
President of Earth

Michael Hawkins
General Williams

Peter Birrel
Draconian Prince

Lawrence Davidson
Draconian First Secretary (uncredited)

Timothy Craven
Cell guard (uncredited)

Ray Lonnen
Gardiner

Barry Ashton
Kemp

John Rees
Hardy

James Culliford
Stewart

Louis Mahoney
Newscaster

Roy Pattison
Draconian space pilot

Karol Hagar
Secretary

Harold Goldblatt
Professor Dale