Event One Event One , also known as the Big Bang , was an explosion , the biggest " in history " according to Nyssa ( TV : " Castrovalva " ) and the biggest " of all time " according to Fifth Doctor , ( TV : " Terminus " ) which resulted in the creation of the universe . ( TV : " The Big Bang " ) The Beast called it " the Cataclysm " . ( TV : " The Satan Pit " ) History . Pre - universe . At least one universe existed before the one the Doctor lived in . ( PROSE : " The Pit " , PROSE : " Millennial Rites " , TV : " Secrets of the Stars " ) The Great Old One s , PROSE : " The Quantum Archangel " ) the Beast , and the Disciples of the Light , natives of this pre - universe , survived the Big Bang . ( TV : " The Satan Pit " ) The Ancient Lights continued some sort of existence after Event One , but was unable to enter the new universe . ( TV : " Secrets of the Stars " ) Before the universe , two beings of good and evil , possibly related to the Great Old Ones , existed and were caught in the explosion . While it is unclear what happened to the good force , the evil force , which later came to be called Fenric , survived and encountered the Doctor in 3rd century Constantinople and in Maiden ' s Point in 1943 . ( TV : " The Curse of Fenric " ) The Second Doctor tricked the Vist into travelling back in time to before the Time Lords evolved so they could claim ownership of time . Instead , they travelled to a point before the Big Bang , where there was no time for them to move across , and were thus trapped there forever . ( AUDIO : " The Forbidden Time " ) The Eleventh Doctor tricked the Kin into thinking he was taking it to the Dawn of Time . Instead , he took the Kin to the moment just before the Big Bang and left it there , in the Void before Creation , where it could do no harm to the universe . Its last word before the Doctor left was , " Doctor ! " ( PROSE : " Nothing O ' Clock " ) The Doctor ' s universe . During the first period , there was an " empty void " , ( TV : " Terminus " ) then matter exploded outward in the form of hydrogen . ( TV : " Castrovalva " ) The Doctor speculated that the massive ship " Terminus " had time - jumped at some point , discharged its fuel and instigated the Big Bang before time - jumping a second time back from the distant past . ( TV : " Terminus " ) Another account had a Time Lord from the High Council stating to the Sixth Doctor that the " Vipod Mor " , headed back in time to the creation of a galaxy , overshot and travelled back to before the universe , thus causing the Big Bang as a " dense monoblock of matter " . ( AUDIO : " Slipback " ) The Leptonic Era followed the Big Bang . ( TV : " Time and the Rani " ) A bug - like species nicknamed bookworm s fed on debris at the Big Bang and collapse of the universe . ( COMIC : " Hunger from the Ends of Time ! " ) The Big Bang Two . The universe in which the Doctor ' s adventures took place was destroyed when the Doctor ' s TARDIS exploded . In order to reverse the damage , the Eleventh Doctor used the combination of the exploding TARDIS and the Pandorica to create Big Bang Two , a second Big Bang that effectively reboot the universe . ( TV : " The Big Bang " ) References to the Big Bang . During the Thousand Year War , a Time Lord told the Fourth Doctor that the Time Lords had mastered transmat technology when " the universe was less than half its present size " . ( TV : " Genesis of the Daleks " ) According to the Seventh Doctor , the creation of the universe occurred 13 , 500 , 020 , 012 years before a specific date in the early 22nd century , when he decided to celebrate it . ( PROSE : " Transit " ) The Fourth Doctor implied that he had watched it happen , or at least that other sentient beings had done so . ( TV : " Destiny of the Daleks " ) The delusional Monarch , believing himself God , wished his ship to travel back to the beginning of the universe and witness himself creating it . ( TV : " Four to Doomsday " ) A Vess weapons factory was set in a pocket dimension sustained with energy drawn from the Big Bang . ( AUDIO : " The Light at the End " ) According to the Eleventh Doctor , the Eye of Time was believed by some to be the left - over core of the Big Bang . ( GAME : " City of the Daleks " ) When asked " what happened " , the Twelfth Doctor referred to the Big Bang , dinosaur s and biped s . ( TV : " The Girl Who Died " ) Other information . The White Guardian was most powerful at Event One , where his counterpart , the Black Guardian , could not interfere . ( PROSE : " The Well - Mannered War " )