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

Paul Bernard

David Maloney