Doctor (Slyther)
From Tardis Wiki, the free Doctor Who reference
Doctor was the name given by Missy to a Slyther which lived on the reconstructed planet Skaro following the Last Great Time War. The Slyther had been adopted as a pet by Missy after she escaped the revolt in the Dalek City. She allowed it to eat the Thals they came across. (PROSE: Postcards from the Universe)
