1000 years ago, a mechanical savvy unicorn froze himself into ice, for reasons he doesn't remember. After getting his bearings set straight by Twilight Sparkle and meeting some of the folk in Ponyville, he sets off to try and remember why he did.
As he does, the Doctor Whooves TARDIS goes near haywire picking up a massive disturbance in both time and space somehow connected to the mysterious Unicorn for reasons he does not know, nor can he figure as he tries to find out why understand.
All the while, forces sealed away with him are coming back leading to somethign nopony wants

Edited by Mcyav