Trenzalore Trenzalore was a Level 2 human colony planet , where the village of Christmas was located . Christmas contained the last remaining crack in space - time , through which the Time Lord s broadcast the Question and triggered the Siege of Trenzalore . ( TV : " The Time of the Doctor " ) In the original timeline , the Siege ended with the death of the Eleventh Doctor and the transformation of his TARDIS into his tomb . ( TV : " The Name of the Doctor " ) Astronomical data . Trenzalore was a blue planet with a human - breathable atmosphere , rings , and two moons , Soror and Frater . ( PROSE : " Strangers in the Outland " ) Daylight in the village of Christmas only lasted a few minutes , and it was frequently snowing . ( TV : " The Time of the Doctor " ) In the original timeline , after the Siege of Trenzalore resulted in the Doctor ' s death , Trenzalore became a barren wasteland covered with molten cracks , and had lost its rings and moons . ( TV : " The Name of the Doctor " ) Trenzalore was of no strategic value to the Nestene Consciousness as it was almost entirely unpolluted , with no toxins , chemicals , acids , metals or smoke in the air . The Doctor was the only reason it had to breach the planet ' s technology barrier . ( PROSE : " Strangers in the Outland " ) Geography . Christmas was a human town ( TV : " The Time of the Doctor " ) where snow was farmed . ( PROSE : " Let it Snow " ) Beyond Christmas , other sites included the Doctor ' s tomb , ( TV : " The Name of the Doctor " ) Outland , Devil ' s Elbows Canyon , the Goat Path , Lake Lagda , Fafnir ' s Crest , the Choke , ( PROSE : " Strangers in the Outland " ) the Glade of Everdell and Preacher ' s Clump . ( PROSE : " Let it Snow " ) History . Before the Doctor . Trenzalore was settled by humans approximately 150 years before the Siege of Trenzalore , at which time the Truth Field did not exist . ( PROSE : " The Dreaming " ) The early settlements stockpiled boronite , which they used to reach underground hot springs by exploding the bedrock that covered them . The leftover boronite was eventually shelved . ( PROSE : " Strangers in the Outland " ) The Siege of Trenzalore . The last remaining crack in the universe was located in Christmas . After they were transported to a pocket universe by the Doctor , the Time Lord s transmitted the Question , " Doctor Who ? " , and a Truth Field through the crack . If the Doctor answered with his name , they would know that it was safe to return to the universe . ( TV : " The Time of the Doctor " ) The transmission set off the Siege of Trenzalore , in which the Eleventh Doctor made his last stand against hordes of alien races who sought to prevent the return of the Time Lords . ( TV : " The Time of the Doctor " ) The planet became a desolate graveyard and the Doctor died , having exhausted his regeneration s . His " body " was laid to rest within his tomb : his dying TARDIS that had become gigantic due to the deterioration of its dimension dampeners . ( TV : " The Name of the Doctor " ) The " fall of the Eleventh " upon the fields of Trenzalore became the subject of a prophecy , related to the Eleventh Doctor by Dorium Maldovar . ( TV : " The Wedding of River Song " ) Original timeline . After the Siege but earlier in the Eleventh Doctor ' s personal timeline , the Great Intelligence forced him to go to Trenzalore by kidnapping his friends . Due to the possibility of catastrophic paradox , the TARDIS landed on a future Trenzalore with great reluctance . The Doctor and Clara Oswald confronted the Great Intelligence within the Doctor ' s tomb , his size leaking TARDIS , where instead of a body they found a complex " scar " in space - time that allowed entry into the Doctor ' s time stream . The Great Intelligence entered the scar , sacrificing its life to turn all the Doctor ' s victories into defeats . Clara too entered the scar , splintering herself into many " echoes " to save the Doctor across multiple lifetimes . After his timeline was restored , the Doctor pulled Clara out of the scar , risking the collapse of his entire time stream to do so . ( TV : " The Name of the Doctor " ) After saving Gallifrey from the Last Great Time War , the Eleventh Doctor revealed to the Tenth Doctor that he had visited his tomb on Trenzalore . His younger self commented he didn ' t want to go there . ( TV : " The Day of the Doctor " ) New timeline . The history of Trenzalore was changed by the Time Lords . The Eleventh Doctor had grown old and frail after 900 years of fighting the Siege . ( PROSE : " " ) With no more plans or lives , he decided to surrender himself to the Daleks , the last enemy remaining at Trenzalore . Clara appealed to the Time Lords for help , stating that " the Doctor " was the only name of his that mattered . The Time Lords opened the crack and granted the Doctor a new set of regenerations , sealing themselves off from the universe in the process . The Doctor used his regeneration energy to destroy the Daleks and save Christmas . Departing Trenzalore in his TARDIS , he regenerated into the Twelfth Doctor . ( TV : " The Time of the Doctor " ) Because of his actions on the planet , the Testimony gave the Doctor the name of the " Beast of Trenzalore " . ( TV : " Twice Upon a Time " )