Derpy Hooves was traveling across time and space with her friend Doctor Whooves when they were captured by the Daleks. Now Derpy is trapped in the TARDIS as it plunges down deeper and deeper into the core of the Daleks ship/super weapon the Crucible. With the TARDIS falling apart around her, will this be the clumsy mailmare's last trip? Or will an old severed hoof be the key to her salvation? Inspired and based on episode 14 of season 4 of Doctor Who, so it contains some spoilers. It would help to be familiar with the Doctor Who series before reading.