First, I'd like to note that the reason I picked "human" in the categories is that the main character starts off in his humanoid form. It isn't going to be until later that he turns into a pony. How, you may ask? Well, I’m not going to spoil the story any more than I already have.
Anyway, this story is about another Time Lord who finds himself trapped in the MLP universe. He aims to get back to his own universe, but it will be a long adventure before he is stuck with the choice to either stay or leave. But until then, he will watch the timeline to make sure that nobody tries to alter it, while at the same time look for a way back to his own universe. However, his interaction with the ponies in Equestria will make it that much harder. He will also join forces with the most unexpected of companions.
This ends the description.