Fury from the Deep
Maggie Harris was the wife of Frank Harris. She lived at the Euro Sea Gas refinery with her husband.
Maggie was stung by a piece of seaweed that was under the control of the weed creature. She then became ill. She was gassed with toxic gas by Mr Oak and Mr Quill, who were under the control of the weed creature. She too fell under its mental control, but was eventually freed thanks to the Second Doctor. Maggie and her husband took in Victoria Waterfield when she decided to leave The Doctor. (Fury from the Deep)