The left wall of Sugarcube corner had been nearly completely demolished by the box, and it was a testament to the skill of the earth-ponies who had constructed the building that it was still standing at all. She shook her head and went to examine the words at the top of the thing that had caused all the havoc.
"Police public call box" she murmured softly, eyes almost glowing with curiosity

Twilight Sparkle is planning on having a relaxing day, but that all changes when a blue police box crashes into Sugarcube corner. Now Twilight, Pinkie, and a strange stallion named the Doctor have to try to save Equestria from a threat disguised as their own beloved ruler.

Currently going through a chapter by chapter rewrite, so apologies for any disconnect between edited and unedited chapters
Chapters currently rewritten:
Chapter One
Chapter Two
Chapter Three