Time lock A time lock , or temporal lock , was a mechanism whereby an event or series of events was rendered unreachable by time travel , blocking off a section of the Time Vortex . The effect was described as being like a wall , ( AUDIO : " " ) and Ace explained that a time lock could seal a planet inside a spacetime envelope , wiping it out of history . ( AUDIO : " Random Ghosts " ) It was thought impossible to pass through a time lock , but this was proven false ; Dalek Caan did so , but at the cost of his sanity . ( TV : " The Stolen Earth " ) There were also other workarounds to enter a location blocked by a time lock , such as the use of a stasis cube to displace and freeze a moment of time outside of the natural progression of reality . With the event in question suspended from the actual flow of time , one could then enter it directly without needing to physically travel through the Time Vortex . ( TV : " The Day of the Doctor " ) Most notably , the histories of both Gallifrey and Skaro were time locked during the Last Great Time War . ( AUDIO : " Legion of the Lost " ) The war itself would be time locked following its conclusion . ( TV : " The Stolen Earth " , " The End of Time " ) Places unfortunate enough to be partially caught in a time lock could be splintered between timelines , as was the fate of Lujhimene when it was caught on the edge of the time lock used to seal off the Last Great Time War . ( COMIC : " Running to Stay Still " ) TARDIS component . The Doctor ' s TARDIS possessed a time lock . ( GAME : " TARDIS " ) When the TARDIS was suspended in space by the Great Intelligence , the Second Doctor wondered if the time lock had slipped , ( TV : " The Web of Fear " ) since the lock enabled smooth materialisation in and out of the Vortex . ( PROSE : " Harvest of Time " ) Use . By the Doctor . When the Doctor ' s TARDIS and the Master ' s TARDIS had each landed inside the other , the Third Doctor and each put a time lock on the other ' s TARDIS to prevent escape . ( TV : " The Time Monster " ) In the New Earth System , the Fourth Doctor used the Dalek s ' time transporter to create a time lock that froze the Daleks and the Werelox on board the Dalek battlecraft in one moment of space and time forever . ( COMIC : " Doctor Who and the Dogs of Doom " ) When the Doctor used the Moment at the end of Last Great Time War , the entire war was time locked . ( COMIC : " Don ' t Step on the Grass " ) On one occasion when Donna Noble was beating the Tenth Doctor at backgammon , he placed the board in a time lock until Donna became bored and gave up . ( AUDIO : " Time Reaver " ) Dalek Caan overcame the lock on the Time War after making an emergency temporal shift and travelled back to the Gates of Elysium to save Davros . The process flooded Caan ' s mind with total knowledge of the past , present and future , driving him insane . ( TV : " The Stolen Earth " ) The only other things capable of breaching the time lock were those that were already in place , like the signal that had been transmitted back through time into the Master ' s mind and , on at least one occasion , very small objects , such as the White - Point Star diamond sent by Rassilon to follow the signal in ' s head . ( TV : " The End of Time " ) When the Tenth and Eleventh Doctor s confronted the War Doctor as he prepared to use the Moment , the Tenth Doctor noted that they shouldn ' t have been there as the events should be time locked . The Eleventh Doctor deduce d that something let them through . Later , the Doctor ' s ten other incarnations were able to breach the time lock to save Gallifrey . ( TV : " The Day of the Doctor " ) By Time Lords . It was one of the Time Lord s ' ancient weapons , ( AUDIO : " Random Ghosts " ) used to hide their secrets and misdeeds . When Skagra used " The Worshipful and Ancient Law of Gallifrey " to access Shada , Romana II hypothesised that they were passing through a time lock , ( PROSE : " Shada " ) and later referred to a time lock as " Shada technology . " ( AUDIO : " Ascension " ) Matthias quarantined Time Lords infected by the Dogma Virus in time - locked facilities . ( AUDIO : " Ascension " ) The entirety of the Last Great Time War was time locked , the edges of the time lock even tearing through the middle of planets such as Lujhimene . ( COMIC : " Running to Stay Still " ) Gallifrey ' s history was protected from potential Dalek incursions by a time lock during the Last Great Time War . ( AUDIO : " Legion of the Lost " ) Nevertheless , the Daleks tried to travel back to prehistoric Gallifrey to prevent the Time Lords from evolving , ( PROSE : " Engines of War " ) and the War Doctor himself travelled back to the First Segment of the war to thwart a Dalek plot . ( PROSE : " The Stranger " ) however , the Twelfth Doctor unknowingly arrived on Gallifrey in his past in his TARDIS , which led Clara Oswald into meeting the First Doctor when he was still a child . ( TV : " Listen " ) Following the removal of Gallifrey from the universe , it was no longer time - locked and could be reached by TARDIS at its new position at the end of the universe following its release from the pocket universe . ( TV : " Hell Bent " ) By Daleks . Led by a new Emperor Dalek , the Daleks of the New Dalek Paradigm planned to remove Gallifrey from existence and become the new Lords of Time . They used a piece of the Eternity Clock to put a time lock around a large part of London in 2106 . Once they perfected their time lock technology , they planned to use it to put temporal bubbles around other planets , making them unstoppable . However the Eleventh Doctor and River Song stole a Time Capsule from the Silent s to break through the Daleks ' time lock . They infiltrated the Emperor ' s Flagship managed to take back the piece of the clock . ( GAME : " The Eternity Clock " ) Skaro ' s history was protected from potential Time Lord incursions , such as the Fourth Doctor ' s original mission to prevent the creation of the Daleks , ( TV : " Genesis of the Daleks " , AUDIO : " Ascension " ) by a time lock during the Last Great Time War . ( AUDIO : " Legion of the Lost " ) Evidently , the time lock was no longer in effect following the war as the Twelfth Doctor unintentionally arrived on Skaro during the Thousand Year War , leading to him meeting Davros as a child . ( TV : " The Magician ' s Apprentice " ) By Torchwood . Another sort of time lock , created by Torchwood 3 ' s resident genius Toshiko Sato , was designed to freeze the Torchwood 3 Hub in a bubble in time . It was at the same time impenetrable but inescapable . The time lock was either shut down or damaged when a Dalek trapped at the edge of the bubble was blown up by the Meta - Crisis Tenth Doctor . ( TV : " Journey ' s End " ) By Ace . At the Time Lord Academy on Gallifrey , Ace was given the planet of Talmeson to watch over . The planet was eventually wiped out by the Daleks . That was when she decided to wipe out the Daleks by time locking Skaro using an Omega device . When the Doctor found out that Ace went missing , he sent Bernice Summerfield to find and stop her . ( AUDIO : " The Lights of Skaro " ) By the Weeping Angels . The Weeping Angel s could create something that essentially functioned like a time lock by causing too many time displacements , such as the one that separated the Doctor from Amy Pond and Rory Williams in New York . ( TV : " The Angels Take Manhattan " ) Expression . The Vist looked down upon the " time - locked races " in reference to their natural time travel ability . ( AUDIO : " The Forbidden Time " ) Time streams . All individuals had personal time stream s that they could not travel into , much like a time lock ; however , this only applied to the time stream of a particular individual , and it was more easy to cross . ( TV : " The Wedding of River Song " )