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Tom Baker
The Doctor

Elisabeth Sladen
Sarah Jane Smith

Ian Marter
Harry Sullivan

Nicholas Courtney
Brigadier Lethbridge-Stewart

John Levene
RSM Benton

Patricia Maynard
Miss Winters

Michael Kilgarriff
The Robot

Edward Burnham
Professor Kettlewell

Alec Linstead
Jellicoe

Timothy Craven
Short

Clive Barrie
Phillips

Walter Goodman
Joseph Chambers

Jon Pertwee
The Doctor