Petra (Dead Media)

Petra was a Quantum physics student at St Luke's University, where she was lectured by the Twelfth Doctor. In 2017 she asked the Doctor do participate in her podcast, People of St Luke's. However, the two of them discovered a creature which lived between dimensions, which the Doctor released, not realising its destructive power. Petra died saving the university, and the Doctor paid tribute to her sacrifice in the unbroadcast podcast. (AUDIO: Dead Media)