Technician (Frontier in Space)

A technician helped General John Williams use the mind probe on the Third Doctor in 2540.

Biography
The technician warned the general not to use so much power, thinking it would harm her subject.

In the end, however, it merely destroyed her machinery, as the Doctor was skilled at defeating mind probe technology. (TV: Frontier in Space)

Behind the scenes

 * The technician is male in Malcolm Hulke's novelisation.