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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