The Eleventh Doctor, River Song and Amy Pond witnessed the Byzantium crash on Alfava Metraxis during the 51st century. It carried a Weeping Angel and when the ship crashed, the Angel was let loose. (TV: The Time of Angels) It transpired that the Angel had sabotaged the ship and forced it to crash, so its starving brethren on the planet could feed off the ship's energy. Once crashed, the ship began to emit radiation from its drives, harmful to humans but a source of food for the Weeping Angels.