Professor Stone was the creator of the Dionysus Project, originally funded by the Forge but then the military. She was one of the people who saw the use of the project as a weapon. However, after Stone activated the Dionysus machine, Reverend Matthew Townsend overloaded it, tore a rip in the fabric of reality and saw the Divergence. Shortly thereafter, she was killed by a bomb placed by the Cuban spy Miss Foster, as were Townsend, his niece Mary Elson, Captain Neil McDonnell and Foster herself.
While dealing with the aftermath of the explosion of anti-time, the TARDIS created a series of holographic projections, taken partly from reality and partly from the memories of the Eighth Doctor, Charley Pollard and the TARDIS itself. One such projection was the event at Cardington, looking for information on the Divergence. Inside this projection, it placed Charley in the role of a ministry driver and itself in the role of the Minister for Defence. The projection of Stone was created using the image of the Fifth Doctor's companion Peri Brown. (AUDIO: Zagreus)