It was just supposed to be a routine archaeological mission. Twilight was looking forward to exploring the ancient temple and heading back home to Ponyville and her friends as soon as possible. But, soon ponies start disappearing, and statues never seem to be in the same places. Through the gloom and the darkness Twilight is forced to fight for her life, with only the hidden recordings of a mysterious stallion to guide her.
Source for Police Box image: http://www.crazystickercollection.com/wp-content/uploads/2014/11/doctor-who-tv-series.jpg