Zoria

During an adventure which they were forced to repeat at least one million times by a time loop after entering the Time Fracture, a human learned "Zoria ' s secrets". The Doctor was also aware of these. (PROSE: Hello And Congratulations!)

Behind the scenes
Zoria was a major character in the Time Fracture interactive story, where she was presented as a Time Lady from the Last Great Time War, scheming to resurrect Rassilon. Depending on the performance, she was played by Ivy Corbin, Jessica Hern or Chioma Uma.

In the webcast Is anyone receving these transmissions?, Robert Dudley makes reference to an agent who is gathering parts to something. With the context of the Time Fracture stage play, it's clear he is referring to Zoria.