Idris Idris was a humanoid woman who was used as a host for the matrix , or consciousness , of the Doctor ' s TARDIS . Biography . As Idris . On the asteroid inhabited by House , Idris lived with fellow humanoids Uncle and Auntie and an Ood called Nephew . Unlike the others , she was never " repaired " by House . Nephew ( under House ' s orders ) drained Idris of her mind and soul in preparation for the arrival of a Time Lord , the Eleventh Doctor . House then removed the matrix from the Doctor ' s TARDIS and placed it inside Idris ' body . At this point , though her body was still intact , Idris essentially died ; although House later referred to the TARDIS by the name Idris , there was no obvious indication any of her consciousness survived after Nephew drained her . ( TV : " The Doctor ' s Wife " ) As the TARDIS . When the Doctor , along with Amy Pond and Rory Williams , exited the then - dead TARDIS to investigate why the matrix had vanished , they were quickly spotted by Idris . She now housed the soul of the Doctor ' s TARDIS . Idris began manically calling the Doctor " my thief " and tried introducing herself properly as the TARDIS , but could not remember what the words were . She was quickly followed by Uncle , Auntie and Nephew , who tried to keep Idris away from them by lying about her being insane . After biting the Doctor , Idris told the travellers two things : Petrichor meant the smell of dust after raining and the " little boxes " will make the Doctor angry . When told to get some rest , Idris asked if there was an off switch and instantly fell asleep , before being carried away by Nephew . She was locked away in a small cell . After regaining consciousness , she began rambling random things that she would later say to the Doctor and his companions until noticing that the Doctor was no longer with her ; she then called out to him . Following his discovery of the hypercube s House had been using to trap Time Lords , the Doctor released her . She then explained that House eats residual artron energy from TARDISes . As she was the last TARDIS , House possessed her former shell and fled to search for more food , with Amy and Rory trapped inside . Idris later watched with the Doctor as Auntie and Uncle died . When the Doctor asked her if she had a name of her own , she responded that the Doctor called her " Sexy " . Idris realised that her body was too weak to house the TARDIS ' matrix , and she had under an hour left to live . Eventually they agreed to rebuild a makeshift TARDIS from a " graveyard " of the other dead TARDIS , while they bonded . Idris then infused the mechanical bits with a part of the TARDIS ' inherent energy to allow them to follow House . The Doctor had Idris send a telepathic message to Amy with details on how to get to a backup control - room and lower the shields ; having been told by the Doctor to send a message to " the pretty one " , Idris sent the message to Rory , much to his chagrin . When they got the shield down , the new console landed on Nephew and blasted him into atoms . The Doctor quickly introduced Amy and Rory to Idris . Idris collapsed , close to the end of her life . The Doctor tricked House into transporting them into the main control room . The Doctor pretended to congratulate House for defeating them . When Idris died the matrix was released inside the control room and merged back with the TARDIS . It proceeded to purge House from the TARDIS in a battle of souls that House couldn ' t win . With the last of her energy , the matrix used Idris ' s body to tell the Doctor that , although she would always be there for him , this was the only occasion when they could talk , using her last moments with a voice to say the word she never got to say to him when he first left Gallifrey : " Hello . Hello , Doctor . It ' s so very , very nice to meet you . " The Doctor wiped a tear from his eye as Idris ' body burned up . Idris , when about to die , kept repeating into Rory ' s ear , " The only water in the forest is the river , " adding " Some day you ' re going to need to know that . " ( TV : " The Doctor ' s Wife " )