Kate spent her youth not knowing of her father's activities with extra-terrestrial beings, believing whole-heatedly that his life consisted of a boring and simple military job. She and her mother spent much time ironically joking that he was constantly off on amazing adventures when they both knew the "truth." Kate would not begin to scratch the true surface of her father's life until years later, when she shared an encounter against the Great Intelligence with him. She would spend some time some time investigating UNIT an her father's ties to it, at one point encountering ex-UNIT operative Douglas Cavendish to investigate a "haunting," which revealed itself to be a Dæmon. She soon joined the organisation, rising to its top position and changing it to be a more scientific, peaceful group.