Zagreus ( audio story ) Publisher ' s summary . " FOUR DOCTORS - ONE DESTINY " Zagreus sits inside your head Zagreus lives among the dead Zagreus sees you in your bed And eats you when you ' re sleeping . Plot . Wonderland . " Following directly from the events of Neverland , the casket of anti - time which was destined for Gallifrey had exploded within the confines of the TARDIS . It seems that the Eighth Doctor and Charley have saved Gallifrey , and that the paradox of Charley ' s existence had been resolved , but the Doctor begins behaving strangely — he has been taken over by Zagreus . The Doctor / Zagreus rages through the TARDIS and strikes Charley , but there is a loud explosion , and when they recover the Doctor / Zagreus is alone in the TARDIS . Charley finds herself in Harley Street talking to her mother Lady Louisa Pollard , who mentions amongst other out of place information that one of her sisters is called Romana . Charley is taken to see a Dr Zagreus , and her mother turns into a white rabbit from Alice ' s Adventures in Wonderland . Charley then meets someone whom she recognises as the Brigadier . The Doctor / Zagreus , unsure of his true identity , stumbles into a TARDIS library . He hears a mysterious voice in the TARDIS , that of one of his previous incarnations , the Third Doctor . The Brigadier tells Charley that everything she has seen is a holographic projection created by the TARDIS . She is then shown scenes from her own memory to provide her with insight into what has happened to the Doctor . The Doctor leaves the library through a secret passage and finds a part of the TARDIS unaffected by the anti - time infection , from where he is able to converse with Zagreus . Zagreus shows him all possible alternate time lines , including universes where the Doctor plucked out one of his own hearts , and tells the Doctor that he would destroy all of them if he was unleashed . Charley and the Brigadier find themselves in another holographic projection , this time a 1950s army barracks . Charley realises that the Brigadier is also a hologram , created by the TARDIS . The Brigadier mentions something called " The Divergence " and says that the Time Lords would not be able to intervene lest they become infected with the anti - time . In the TARDIS , the Doctor hears the Third Doctor ' s voice again and finds a book The Alice Compendium in which he reads Charley ' s name and the phrases " the divergence " and " Nana Saviltride " . Charley and the Brigadier realise the projection is of Cardington , where the R101 was launched in 1930 . There , a Doctor Stone is conducting an experiment , which causes a huge explosion . The Doctor hears the explosion and rushes to the TARDIS control room , but finds himself instead in a forest . There he encounters a huge talking Cat and a large metal box . The Cat tricks the Doctor into entering the box and seals him in with a cyanide bottle , which is a Schrödinger ' s cat demonstration . The Doctor realises the meaning — if he left the TARDIS he would become either fully himself or fully Zagreus . At Cardington , Stone argues with the base chaplain Matthew Townsend about his research . Townsend expresses reservations about possible military applications of Stone ' s research , and wonders about the course of human evolution . Charley overhears Stone talking about the military application of " Dionysus " — the code name of her project . It had torn a hole in reality , which might be used as a weapon . Miss Foster , who had told Charley and the Brigadier that she was a military secret agent , tries to plant a bomb on the Dionysus project ; she was in fact a spy for communist Cuba . Threatening to kill them all , Foster forces Townsend to operate the machine , creating another rift in time . All but Charley and Townsend are sucked into the rift ; on the other side of the rift are creatures trying to break through . Heartland . On ancient Gallifrey , the Great Mother and her High Priestess Cassandra await the arrival of Provost Tepesh and Lady Ouida . Upon their arrival , they discuss why their groups despise Rassilon . Rassilon has destroyed followers of the Great Mother ' s religion , and Tepesh is of the Arcalian Chapter , whom Rassilon has hunted nearly to extinction . Together , they plan to attack Rassilon ' s Foundry , his secret base . Charley and Brigadier are between holographic projections . They discuss what they saw at Cardington , creatures from outside of the boundaries of time and space trying to break through . Charley wonders aloud whether she could take the Doctor ' s place by absorbing Zagreus into her , allowing the Doctor to go free . The Doctor is beginning to unravel the mystery . The Cat is another avatar of the TARDIS . The Doctor ' s being in the forest was to protect him from events elsewhere . He realises " Saviltride " is an anagram of " evil TARDIS " , from which he deduce s that not only was his only personality split in two , so was that of the TARDIS . Tepesh and the Great Mother enter Rassilon ' s Foundry where they meet Charley , however they perceive her as being Rassilon . Cassandra says something which offends Tepesh , and he orders Ouida to kill her and drink her blood . She cannot regenerate as Rassilon was still in the early stages of the genetic experimentation into the Time Lord gift . When an automated system reveals some of Rassilon ' s secrets , Charley discovers that Rassilon , fearing for the survival of the Time Lords , created self - replicating biogenic molecules and sent them back in time . The effect of these molecules was to ensure that all life - forms in the universe evolved to something approximating the Gallifreyan norm . To prevent creatures from the Divergence entering our universe , he then sealed time into a loop . The Dionysus Project that Charley saw at Cardington had breached the loop , allowing creatures from the Divergent universe to enter ours . Tepesh reveals that the Vampires had only drunk the blood of specially bred animals , but Rassilon ' s purges forced them to drink the blood of intelligent species in order to survive . He refrains from attacking Charley / Rassilon until he has discovered all the Foundry ' s secrets . The automated recorder reveals the Foundry draws its power from the Divergent universe . When the Brigadier advises Charley to switch off the power , this allows creatures from the Divergence to break through . The Great Mother reveals that Rassilon stole the secret of regeneration from the Vampires , and that much of Time Lord technology was stolen from the Divergent universe . The Foundry ' s defences seal off the whole base and prepare to fire storm it to prevent the escape of the Divergent creatures . The Brigadier and Charley escape through a mirror , but Tepesh , Ouida and the Great Mother are killed . Charley finds herself within another scenario , and this time her appearance is that of a 6 - foot - tall ( 1 . 8 m ) mouse in battle armour . She is in some sort of bizarre theme park where animatronic animals are battling with animatronic humans . The Doctor meanwhile is fighting against the TARDIS , destroying parts of its architecture . The Brigadier arrives , and is revealed to be an avatar of the TARDIS ' s Zagreus personality . To defend the TARDIS , the Brigadier summons a Jabberwock , and the Doctor flees . Charley encounters Goldilocks , the leader of the enemy humans . They are fighting to get control of the Animator , but both sides wish to release from suspended animation so they do so . The Animator , Walton Winkle , was suspended in the year 2367 . To his horror , he discovers he has been in suspended animation for 60 billion years and has awoken on the dead world of Gallifrey , which the theme park was moved to . They are on what was once the Foundry , and the animatronic creatures have fallen under the influence of the Divergence creatures . They revived Winky to operate the controls of the Foundry machines , but he dies of the heart condition which he had entered suspended animation to survive . Having escaped the Jabberwock , the Doctor now plucks Charley out of the simulation . Charley is unable to trust the Doctor as he had hit her earlier , and she no longer trusts the Brigadier avatar . Rassilon himself appears and reveals that after the explosion , the Doctor and Charley had been unconscious for six months , in which time Rassilon had persuaded the TARDIS to aid him in exchange for freeing it from the Doctor / Zagreus ' s influence . On Gallifrey , Cardinal Braxiatel informs Romana that the Doctor ' s TARDIS has dematerialised of its own accord . Leela then arrives with a message from Rassilon concerning the fate of the Doctor . Charley finds herself in a bleak landscape , together with Townsend , Tepesh and Winkle . Ahead of them they see a Dark Tower — they are in the Death Zone on Gallifrey . Wasteland . Romana , Leela and K - 9 transmat to Rassilon ' s tomb within the dark tower . Rassilon ' s spirit speaks through Leela , and leads them to a Matrix simulation of the Dark Tower in ancient times . Meanwhile , Charley informs Townsend , Tepesh and Winky that they are Zagreus ' s recreations of the Fifth , Sixth and Seventh Doctors , and also the only people to have ever seen the Divergence . Charley tried to persuade them to go to the Dark Tower , but Tepesh is reluctant to play the Game of Rassilon . The Jabberwock then appears , but Charley subdues it by reciting nonsense poetry , using it to fly them into the Dark Tower . Rassilon demands that Romana resign from the presidency in favour of Zagreus . When she refuses , Rassilon uses the possessed Leela to attack Romana and K - 9 , whose head gets knocked off . The Jabberwock crashes into the Dark Tower , but Charley and the recreated Doctors make their way inside . Their passage is blocked by a booby - trapped chessboard and hear a riddle from Rassilon . The Doctors think the answer is related to the number pi , but upon crossing Winkle is nearly hit by a bowspike . Instead Charley deduce s that they must move across using the knight ' s move in chess . They find Leela attacking Romana , and Charley knocks her unconscious . Rassilon and the Brigadier avatar have chained up the Doctor and are preparing to torture him . When the Doctor asks about Charley , the avatar flies into a rage , ranting about how the TARDIS had suffered in its many adventures with the Doctor , especially its recent absorption of anti - time to save Charley . The Doctor realises the TARDIS is jealous of Charley . Rassilon summons the Doctor and the Brigadier into the Foundry , which he proudly declares to be the place where he created the Nemesis and the De - mat gun . Rassilon shows them a frozen solar system — one which housed a species which could have threatened the Time Lords . The Brigadier avatar destroys the police box shell of the TARDIS in the Foundry ' s smelting works . From the Dark Tower , Romana , Charley , the Doctors and a K - 9 find a secret entrance to the Foundry through the mirror . Townsend cracks a code in Old High Gallifreyan , proving they were created from the Doctor ' s memories and thus retain some elements of his knowledge . Pushing past the Brigadier , they find the Doctor by an anvil creating a sword from the molten TARDIS shell . Rassilon believes that he has destroyed the Doctor ' s sanity thus allowing Zagreus full control . The Doctor ' s other aspects tell him Rassilon is manipulating him as a weapon against the creatures of the Divergent universe , as the creatures of the Divergent Universe would have evolved to surpass the Time Lords before Rassilon locked them away . Rassilon seizes the anti - time sword and slays all the Doctors but the Eighth . Charley , Romana and Leela try to avoid being shot by the Brigadier and Romana transports him into the crucible . The Doctor gives the anti - time sword to Charley , and begs her to kill him before Zagreus takes over . Charley cannot kill him for she loves him , but when the Doctor tells her that he does not love her , she pierces him with the sword before breaking down in tears . The Doctor does not regenerate , however ; when Rassilon killed Townsend , Tepesh and Winkle those parts of him were removed , and when Charley stabbed him they were restored saving him from death . It is Zagreus who awakens , but when Rassilon commands him to enter the Divergent universe to slay the creatures , Zagreus instead throws Rassilon into the Divergence to face his fate , refusing to be Rassilon ' s puppet . Zagreus prepares to attack the Doctor ' s companions , but the Brigadier arrives and overpowers him . In the crucible , the TARDIS had been restored . Now free from the anti - time infection , the Brigadier avatar gives Zagreus a " drink me " potion which purges the Zagreus influence from the Doctor . The Doctor tells Charley that she must leave him — the zero matter in the " drink me " potion has stabilised him , but he is still infected by anti - time . He intends to travel to the Divergent universe to quarantine himself forever and protect the universe from the anti - time infection . Charley storms out of the TARDIS , whereupon Romana speaks to the Doctor telling him that he will never be allowed to return and the Time Lords will prevent him from doing so if he tries . Romana leaves the TARDIS and it dematerialises . Romana asks Leela where Charley is , and Leela asks Romana if she was aware that the TARDIS had a back door . Leela asks if Romana still finds her stupid and Romana says this could be the beginning of a beautiful friendship . The Doctor prepares for his new life in the Divergent universe , excited by the prospect of seeing new worlds and new people . He is not yet aware that Charley will be seeing them with him . . .