The Doctor once again finds himself in the middle of a... situation. Mind you, situations for him never involved getting turned into a talking horse. Well, pretend you have a plan and just go for your trusty Sonic I suppose. ONCE A TIME LORD REWRITE
A mysterious figure, living in shadows, is attacking seemingly random crime leaders and leaving little to no trace. The Mane Six investigate, but they find a secret more startling than what they had ever imagined.