Zero Room The Zero Room was an important room in the Doctor ' s TARDIS . Zero Rooms were used by the Time Lord s in times of difficult regeneration or to rapidly heal . There was , for instance , a renowned polygonal Zero Room under the Junior Senate Block on Gallifrey . ( TV : " Castrovalva " ) They were cut off from the random electrical and radiological influences of the rest of the universe . They were ideal for neurological healing . ( AUDIO : " The Invasion of E - Space " ) They had a tranquil atmosphere . As the Fifth Doctor demonstrated to his companion s , some physical laws did not hold as strongly in a Zero Room as in the rest of the universe . For instance , he could levitate in the TARDIS ' s Zero Room at will . The Zero Room also enhanced his telepathic abilities so he could speak to his companions while resting . ( TV : " Castrovalva " ) When the First Doctor wanted to rest and contemplate , he used the Zero Room . ( PROSE : " The Rag & Bone Man ' s Story " ) Romana II put the Fourth Doctor in the Zero Room after his synapses were damaged . ( AUDIO : " The Invasion of E - Space " ) The Zero Room was used by the Fifth Doctor following the regeneration of his fourth incarnation . In order to generate enough power to break free of Event One , part of the structure of the TARDIS needed to be ejected . Unfortunately , the Zero Room was one of the areas destroyed . Using the remaining walls of the room , Nyssa was able to construct the Zero Cabinet . It had the same properties as the room , which allowed the Doctor to continue recuperating while he was within it . Nyssa and Tegan found the cabinet light enough to carry , in part because the Doctor used levitation to negate his own weight . However , if the Doctor did not concentrate on keeping himself levitated , the cabinet became too heavy to carry , due to his weight , and would plummet to the ground . ( TV : " Castrovalva " ) Later , the Zero Room was reconstructed in the TARDIS . ( AUDIO : " Zaltys " , " Renaissance of the Daleks " ) The Sixth Doctor used it to stabilise Charlotte Pollard when she was sick . ( AUDIO : " Patient Zero " ) He also used it to lessen the effects of time going backwards , when trying to detach a parasitic being from the TARDIS . ( COMIC : " Funhouse " ) The Seventh Doctor kept a reconstructed Zero Room . ( PROSE : " Deceit " ) Soon after the TARDIS became infected by an organic material from Tír na n - Óg , the Doctor began adapting the Zero Room into another console room , disconnected from the universe , so he could escape the effects . ( PROSE : " " , " Deceit " ) This control room / Zero Room was lost when the Doctor ejected it from the TARDIS in an attempt to destroy the sentient computer , Pool . ( PROSE : " Deceit " ) During the early period of the Last Great Time War towards the end of his life , the Eighth Doctor ' s TARDIS lacked a Zero Room as he informed Ollistra while fleeing the Vashta Nerada . ( AUDIO : " Day of the Vashta Nerada " ) The War Doctor allowed Karlax to use the Zero Room after he regenerated . ( PROSE : " Engines of War " ) By the time of the Tenth Doctor ' s use of the TARDIS , the Zero Room was in desperate need of a cleaning . When the Doctor made a tour of the ship alongside Rose - the - Cat , he noted that the Zero room was infected with disconnected floating pieces of rubbish . ( COMIC : " A Rose by Any Other Name " ) The Twelfth Doctor jettisoned the Zero Room , allowing the Celestial Toymaker to use it as his new Toyroom . He remarked afterwards to Clara Oswald that he would need a new Zero Room . ( COMIC : " Relative Dimensions " )