The newly-regenerated Doctor helps UNIT battle a sentient robot being manipulated by a corrupt scientific organization.
The Doctor
Tom Baker
Sarah Jane Smith
Elisabeth Sladen
Harry Sullivan
Ian Marter
Brigadier Lethbridge-Stewart
Nicholas Courtney
RSM Benton
John Levene
Miss Winters
Patricia Maynard
The Robot
Michael Kilgarriff
Professor Kettlewell
Edward Burnham
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