The Ice Queen of Intensive Care, Sister Ashton rules her domain with a rod of iron, rarely ever smiling and insisting that her staff keep a professional detatchment to the patients in ICU and their visitors. This does nothing to endear her to those she works with, Sandra and Pat especially. But despite outward appearances, she' s quite a nice person really. It turned out that she had once gotten involved with a patient who eventually died, and was in such a state afterwards that she resolved never to put herself into that position again, hence the Ice Maiden was born.
Not one of the regular characters, Sister Ashton was played by Marcia King.