Jill Sandbrook

 was part of 's experiments to model a war. She was very officious on her duties and chastised Jamie McCrimmon and Polly Wright for being late. She obsessed over rota's and demarcation. She then helped when the aliens invaded earlier than planned. Eventually the condition fell from her and she helped Jamie, Ben, the Second Doctor, and Polly to defeat the Master (AUDIO: The Home Guard)