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

Michael Wisher

Rex Farrel

Harry Towb

McDermott

David Garth

Time Lord

Frank Mills

Radio Telescope Director

Christopher Burgess

Professor Philips

Andrew Staines

Goodge

John Baskcomb

Rossini

Dave Carter

Museum Attendant

Stephen Jack

Farrell Senior

Barbara Leake

Mrs. Farrell

Roy Stewart

Strong Man

Dermot Tuohy

Brownrose

Norman Stanley

Telephone Mechanic

Terry Walsh

Auton Policeman

Pat Gorman

Auton Leader

Hayden Jones

Auton (voice)

Tommy Reynolds

Troll Doll (uncredited)