Sally Armstrong

 worked at the Ides Scientific Institute. She was the inventor of the VSAI 0001. In 1970 she recieved a message from the "Eighth Doctor" had sent her in his future. The message notified Sally that the Doctor had funded the Institute one billion pounds. She created a time space portal in the Doctor's house in 107 Baker Street, where Daleks came through. She was killed by the Daleks as she tried to escape with the Doctor. (AUDIO: Fugitives) Molly O'Sullivan realised that Sally would now be alive since the timelines were negated after Straxus killed himself. (AUDIO: X and the Daleks)

After the timelines were negated, Sally was meant to die after being hit by a taxi. She was saved by posing under the alias of "Mr Diath". (AUDIO: Time's Horizon) The Master then used Sally to help him use the Eminence for his own ends. He taught her how to pilot his TARDIS during this time. When the Doctor showed up and allowed the Eminence to gain control of the Master's TARDIS, Sally helped the Master to expel it into the Time Vortex. Shortly after, Sally helped the Master to kidnap Molly O'Sullivan. (AUDIO: Eyes of the Master)