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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

Stephen Thorne
Azal

Stanley Mason
Bok

Damaris Hayman
Miss Hawthorne

Don McKillop
Bert the Landlord

Rollo Gamble
Winstanley

Robin Wentworth
Prof. Horner

David Simeon
Alastair Fergus

James Snell
Harry

John Joyce
Garvin

Eric Hillyard
Dr. Reeves