The Master used her Vortex manipulator to escape the Daleks on Skaro, but something went wrong. Now an Equine child she uses her fob-watch to hide herself in this new world.
Unfortunately for everypony, exactly who she regenerated into becomes quite a recognisable figure in pony culture...
(Much like my other DW stories this won't be updated often rather it is a side project, but I will finish it!)