My Little Timelord is a fanfiction by Victorian Hellsly  featuring Derpy "Ditzy Doo" Hooves and Doctor Whooves. This is the first work featuring Derpy as The Doctor's companion. It was published on February 2nd, 2011.
Derpy starts to head to work, when she bumps into Pinkie Pie and Rainbow Dash. They talk about The Doctor for a bit, then a spaceship shows up. Out come a bunch of "metal wastebaskets" that shout "EX-TER-MIN-ATE!" This is only the beginning of the dalek/cyberman invasion.