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"According to my estimation of the resistance to pressure of vegetable fibre, it was stepped on by something that weighed a quarter of a ton!"
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Full of energy but a touch erratic after his regeneration, the Doctor's recuperation is cut short as UNIT investigate a spate of robberies involving components for a top-secret disintegrator gun. The culprit is quickly identified as a highly sophisticated robot built by Professor Kettlewell, but was is the sinister agenda of the Scientific Reform Society? And can the Doctor rescue Sarah from the robot's clutches and avert catastrophe?
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
Robot: Michael Kilgarriff
Professor Kettlewell: Edward Burnham
Jellicoe: Alec Linstead
Producer: Barry Letts
Director: Christopher Barry
Scriptwriter: Terrance Dicks