Doctor Who is a Time Lord from the planet of Gallifrey in the constellation of Kasterborous. He travels through space and time in his TARDIS. The TARDIS doesn't always take him where he wants to go, sometimes he is taken somewhere even he, with over a thousand years of experience, doesn't know a thing about. After being injured during a run-in with a few nasty Daleks and having saved the world the Doctor retreated to his TARDIS where he soon found himself regenerated into a peculiar new form. During his regeneration he was oblivious to the TARDIS' change in routes.

Now, finding his TARDIS as taken him through the void into a new land and he has regenerated into a "whimsical talking colorful pony" he must figure out how to control his new body if he wants to save this new universe and the innocent lives that dwell within from the trouble that he just can't seem to get away from.

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Image by inuhoshi-to-darkpen, whom i have no affiliation with.