Zita

 was a student who noticed something going wrong on her planet. She called out to the Unbound Doctor which allowed her to become a bit more corporeal. She told him about how her school went missing in the simulation. She wanted others to remember the truth and that history was being rewritten. She used bugs in the system to change the world but Bernice Summerfield realised they were features. She decided to leave the simulation after catching up with her old friends. (AUDIO: Clear History)