A newly regenerated Doctor helps UNIT investigate the theft of top secret plans and equipment from a secure premises

Sarah discovers raids have been carried out from an operating plant called Think Tank by a Robot created by a scientist called Professor Kettlewell, whom has been reprogrammed by two of the companies directors

Tom Baker's first story which is fantastic!

Locations

BBC Training Centre, Wood Norton, Hereford and Worcester

Studios

Television Centre Studio 3

Working title

The Giant Robot

Notes

A slightly changed title sequence makes its first appearance, the fifth version, again designed by Bernard Lodge.

John Levene is credited as Sergeant Benton throughout the story, even though the character is promoted to Warrant Officer during Part Two.

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