The Doctor. Never cruel nor cowardly. Never giving up and never giving in. He travels through all of time and space being exactly what his chosen name implies. He is a healer, saving as many lives as he possibly can. But he's not perfect and can't save every life he comes across. So just how does the Doctor cope?

For the past eight years, Apple Bloom has been doing anything and everything to earn her cutie mark, but she still doesn't have it, even after her fellow Cutie Mark Crusaders found theirs.

Having traveled everywhere in Equestria and beyond to find her mark, she's begun to wonder if she'll have to leave the planet entirely before she discovers her destiny.

It turns out that she's not far off from the mark in her guess...

The cover art is lightly adopted from a work by Biosonic 100.

This is a Doctor Who crossover, with the intent that even those readers with only a casual knowledge of the series will enjoy it. It takes place somewhere in Series 6 of Doctor Who, and several years after the end of Season Four in Friendship Is Magic.

There are three things to note in regard to the character tags on this story:

* It's a Doctor Who crossover, and yet there's no character tag for Doctor Hooves. Therefore, you can think of this as a "Doctor Lite" episode.

* It has "Centaur" in the title, and yet there's no Tirek tag. He's not in it, so don't get your hopes up.

* And finally, the "Other" tag is for this character: Green Dragon