A female technician, working for the Controller, scanned the timelines from an alternate 22nd century England for any activity from the guerrillas fighting against their masters, the Daleks. She found repeated activity from a time transmitter in the 20th century time zone, before losing the signal again.
She reported to the Controller that the Third Doctor had infiltrated Centre 117 and she ordered the forces there to capture them. The Controller told her to separate the figures. (TV: Day of the Daleks)