Patricia McBride

 was a professor of anthropology in Sheffield. According to Hebe Harrison, she was the most celebrated professor on Campus. She encountered the Sixth Doctor, Melanie Bush and Hebe whilst they were investigating the Mindless Institute and assisted them in derailing the plot orchestrated by it's leading benefactor, Mr Betterment. (AUDIO: The Mindless Ones)

Some months later, she called in the Doctor, Mel and Hebe from the Emit Institute in Sweden to look into their claims that they can rewind a person's time. After uncovering a crashed ship beneath the facility, she helped the Doctor repair Killian Holm's machine after she destroyed it so he could undo the damage. After the institute was destroyed, Patricia asked for a trip into the future. (AUDIO: Reverse Engineering)

Bringing her to the 26th century, Patricia immediately demanded to return home. After a collision in the time vortex brings them back to the 21st century, the Doctor confronts Patricia, having realised long before that her reaction to the future was because of entirely bigotted views she possessed about the disabled and the unalike, considering the people of the future and those of the present to be simply "wrong". Disgusted, the Doctor sends her away and Hebe, after hearing these views for herself, is equally sickened and shuns her. Confronted by her hatred everywhere she goes, she runs into Khavûl and is made under duress to help him find the Drawnid Oubliette. After Khavûl was defeated, Patricia scuttled off and used Khavûl's abandoned time technology (adopting the username Purity) to alter the world to her own image, making Hebe disappear from existence in the process. (AUDIO: Chronomancer)