The Doctor is now a pony in a pony universe. Being the adventurous Timelord he is, he sets his TARDIS to go to a random destination. Unfortunately that TARDIS has suffered major damage and both it and him are stuck in a time loop. So every time he opens those doors it will be a different place and a different face.

Author's note:
This story is a side project of mine that works as a giant What-If Machine. Essentially the Doctor is in a time loop so the Prologue is always the same, but what happens after is always different. It's kind of like "What if the Doctor met X?" So I'm gonna write in different ponies based on ponies I'm already writing in other stories or situations I'd like to try. So come along and I hope you enjoy. Allons-y!