The Lost Dimension ( comic story ) The Lost Dimension was a miniseries published by Titan Comics . It served as a four - way crossover between Titan ' s ongoing series " " , " " , " " and " " , uniting the four Doctors and their companions , similarly to " Supremacy of the Cybermen " and " Four Doctors " . Plot summary . Part one : Alpha . In a section of space , a white hole has opened and is consuming the surrounding space and planets . It has reached the planet , Sultath , where Jack Harkness and Tara Mishra are . Jack is trying to get the two of them off the planet , but interference from the hole prevents the vortex manipulator from working . He tries to contact the Ninth Doctor , but the interference affects the communication , and the Doctor assumes Jack is in a bar somewhere . With the Doctor not coming to their rescue , it seems all is lost , until the arrival of a mysterious woman in Gallifreyan armor . At St Luke ' s University , the phone in the Doctor ' s chambers starts ringing . Nardole answers the phone , and tells the person calling to hold , while he takes the phone and runs off down the hallway . Over in the library , the Twelfth Doctor is looking at history books and tossing aside ones that are inaccurate , an act that makes it difficult for Bill Potts to study . Nardole arrives , handing the phone to the Doctor . The person on the other end tells him that she ' s dropping in for tea . The Doctor walks over to the nearby window and sees something that makes him turn around and yell for everyone to get out . A bowship crashes into the library . The trio are perfectly unharmed , with Nardole protecting Bill . The Doctor remarks on the ship , before the cockpit opens , revealing the armored woman from earlier . However , the helmet is now off , revealing that she is Jenny , the Doctor ' s daughter . Meanwhile , the Tenth Doctor , Gabby Gonzalez , and Cindy Wu are traveling in the Doctor ' s TARDIS . The Doctor is telling the two women about an adventure he had , when the Cloister Bell starts ringing . Suddenly , the trio find themselves in an earlier version of the TARDIS , and the Third Doctor is on the floor , being consumed by some white energy . The Tenth Doctor tries to help him , but the Third Doctor and his TARDIS fade away , leaving the trio back in their own TARDIS . According to the Tenth Doctor , the two TARDISes were merging , so his TARDIS had used an emergency temporal displacement to escape . Back at the university , the four have moved to the Doctor ' s chambers and are enjoying some tea . Nardole is concerned . The Doctor assumes it ' s about the Vault , but he checked it , and it ' s completely fine . Nardole corrects him by saying he ' s more concerned about the crashed bowship , but the Doctor has dealt with that by calling in UNIT . At the crash site , Kate Stewart has had the area closed off . Petronella Osgood marvels at the ship . But , as she touches it , her hand gets shocked by the strange white energy . Back with the quartet , Jenny explains why she came here . After meeting Jack and Tara , Jenny tried to save them , but the white hole consumed the duo . Jenny rushed back to her ship and followed them in , hoping to save them . But , the ship couldn ' t handle the stress and it looked like Jenny was doomed . However , luck was on her side , as the Fifth Doctor came to rescue her . After failing to extend the TARDIS ' s gravity shield around the bowship , the Doctor was left with no choice but to ram Jenny ' s ship . The bowship was freed , but the TARDIS was caught in the gravity of the white hole and was consumed . Meanwhile , the Eleventh Doctor finishes repairing the TARDIS ' s translation matrix , allowing Alice Obiefune to be able to understand what he ' s saying . An alarm starts going off , prompting the Doctor to go check the console . The Doctor reveals that he lied when he told Alice that hearing the Cloister Bell was the worst thing that could ever happen . The alarm is being caused by the TARDIS ' s Doomsday Circuit , which goes off when it detects the end of time , or , in this case , space . The TARDIS flies into the white void . Back at the university , the Twelfth Doctor asks how Jenny found him . She tells him that this is the only place and time he has stayed still long enough for her to locate him , that she was able to access . Bill has heard enough and knows they need to do something to help the Fifth Doctor , Jack , and Tara . Running over to the TARDIS , she reaches out her hand to open the door . As she touches the door , she is attacked by the white energy , which enters her body . At that moment , Kate and Osgood arrive . The Doctor asks Osgood to help him analyze the white energy attacking Bill , but she refuses . Osgood , Kate , and the UNIT soldiers have been possessed by the white energy . Osgood states that Bill will soon know peace , and so will the others . Part two : Ninth Doctor Special . On the Pacific Ocean , in 1886 , a boat hits something in the water . Using a net , the men pull the object aboard , revealing it to be the TARDIS . The door opens and Rose Tyler steps out , wanting to know where she is . Not long after , the Ninth Doctor emerges . He gets into an argument with one of the sailors , only for it to be broken up by the captain of the ship , Madame Vastra , who welcomes the duo aboard the Mary Anning . Inside her quarters , Vastra and Jenny Flint serve tea to their guests . Vasta and Flint explain to Rose about Vastra ' s origins . The Doctor asks Vastra why she ' s here . Vastra explains about how a Silurian corpse , one from the scholar class , was found and she is now looking for other possible Silurian survivors . The Doctor quickly dismisses the idea and starts to depart with Rose . But , Rose mentions that the Doctor ' s taking her to meet a guru who has three eyes . Vastra knows the Doctor is hiding something and confronts him , but before she can get any answers , the ship is hit by a creature who wrecks the boat . The next morning , Rose awakens to find herself , the Doctor , Vastra , Flint , and a couple of sailors alive on an island . Vastra identifies the creature as a Myrka . She ' s angry at the Doctor for keeping his secrets , as they have now cost her the ship and half her crew . At that moment , the group is surrounded by Silurians . Vastra starts to greet them , but one of them shoots her . The Silurians take everyone except Flint away , while she stays behind to tend to the unconscious Vastra . The group is led to the leaders of the tribe . The Doctor greets one of them , Horlak , who recognises the Doctor . Horlak asks the Doctor why he has come here . The Doctor brings Rose forward . After the incident with Addison Delamar , Rose ' s mind was left fractured . According to the TARDIS , Rose is on the verge of a full psychotic episode . Horlak reaches into Rose ' s mind and begins healing it . A voice calls out from within Rose ' s mind , one Rose recognises to be Jack Harkness . Jack has established a psychic projection through Horlak , so he can communicate with the Doctor and Rose . The Doctor asks Jack how he pulled this off , and Jack steps aside to allow someone else to speak . To the Doctor ' s surprise , the person responsible is the Fourth Doctor . The Fourth Doctor explains that the universe is being devoured . But , the projection begins to break down . The Ninth Doctor uses his sonic screwdriver to boost the signal , but gets interrupted by the arrival of Vastra and Flint , resulting in the projection fading away . The Doctor is furious with Vastra , but Vastra is just as angry . She demands for the Doctor to tell her why he hid this tribe from her . As it turns out , this tribe of Silurians have a disease , Raldoma Syndrome . It doesn ' t affect the scholar Silurians , but it does affect the warrior Silurians , like Vastra . Years ago , the Sixth Doctor helped set up this place , a location to keep these Silurians under quarantine , so they can ' t infect any other Silurians . Rose calls out to the Doctor , pointing out that some of the Silurians have been infected by the white energy . Even Vastra and Flint get infected . Rose quickly picks up one of the Silurian guns and shoots Vastra , freeing her from the energy . The Doctor takes the gun and adjusts it with his screwdriver , allowing him to use it to free everyone else in the room from the corruption . After freeing everyone , the Doctor asks Horlak if he can borrow another gun , as his modification ruined the first gun . Horlak agrees and states that he and the others will creating a telepathic dam to block the corruption of the white energy . As everyone begins to leave , Horlak calls the Doctor back , in order to give him another message from his past . Later , the Doctor joins everyone else back at the TARDIS . The Doctor moves the TARDIS to 13 Paternoster Row . He then asks Vastra to look after Rose , as he ' s going somewhere dangerous that might be the end of him . The Doctor departs in the TARDIS . Flint assures Rose that the Doctor knows what he is doing , most of the time . Unknown to the two of them , Vastra and the sailors have been possessed by the white energy . Part three : The Tenth Doctor . In his TARDIS , the Tenth Doctor stares at a projection of the Third Doctor being attacked by the white energy , while Cindy is wondering just how old the Doctor really is . Suddenly , the TARDIS shakes . The Doctor checks the console and sees they ' ve encountered a temporal funnel and extreme gravitational stresses that are pulling the TARDIS off course . The TARDIS ends up near a space station poised on the brink of the gravity well of a cluster of neutron stars . It ' s also linked to another region of space via a hyperspace corridor . The Doctor makes an emergency landing aboard the station , while wondering what kind of force could draw the TARDIS off course . The trio step outside , and the Doctor realises that the station is a power refining facility , mining energy from the neutron helix . An alarm tells them that the station , Poseidon , is on lockdown . At that moment , two officers , Co - ordinator Akiyama and Senior Hyperspace Tech Mouchgober enter the room . They call out to the Doctor , apparently recognising him . However , it turns out they are mistaking him for Doctor Bell , who is supposed to be visiting the station to conduct an inspection . The Doctor and Gabby quickly trick them into believing that Bell is detained and that the trio are a replacement team . The two officers bring the trio to Central Control , where Director Jessop is not happy to see them . The trio have come at a bad time , as the neutron helix , known as Hades ' Helix , is flaring up . The helix is producing a large amount of electromagnetic radiation . The Doctor quickly moves over to a nearby console . With some adjustments , the Doctor not only fixes the shields , but improves them . With the immediate crisis resolved , Jessop asks Akiyama to take Cindy on an inspection tour , while he will show the Doctor and Gabby around Central Control . Jessop explains that the station is the core collection point for the energy mining . They use collection probes to mine the energy . The probes beam the energy to the station , which transmits the energy through the corridor to the power collection plant at Ultima Tarsus . The corridor also serves as the anchor for the station , protecting it from the helix ' s gravitational forces . Meanwhile , Akiyama and Cindy are down at the docking ports . Akiyama points out one of the collection probes , floating in space . She mentions that two probes when missing some time ago . Cindy notices that the probe is moving to dock with the station , something that the probes are not supposed to do . Cindy suggests it might be one of the missing probes . To Akiyama ' s shock , it is one of the lost probes . Back in Central Control , Jessop tells the Doctor about the missing probes . One of the officers calls the group over to his console . According to the readings , the helix is collapsing inward at an impossible rate , becoming a black hole . The Doctor states it ' s not impossible , but is widely accelerated , possibly artificially . At that moment , Gabby gets a text from Cindy , about the missing probes docking with the station . The Doctor patches Cindy into the comm unit and tells her to get away from the docking port . Whoever is inside the probe is not friendly . The station shakes as it ' s bombarded by time distortions . According to the Doctor , this is not a natural phenomenon , but one that ' s been engineered . Looking at a nearby screen , the Doctor and Gabby see the distortions are being caused by the white energy they saw attack the Third Doctor . The scanners then detect approaching ships , that turn out to be Cyberships . The Doctor yells at Cindy to run away from the docking port , as the station is being invaded by the Cybermen . At that moment , the docking hatch opens , and Cybermen start swarming into the station , attacking the security officers , while Akiyama and Cindy run . Back at Central Control , the Doctor watches the Cybermen infect the security officers , with what looks like some new Cyber - virus . Mouchgober reports that the second probe is docking , which means there will be more of them , but Jessop has changed the access cipher , which will slow them down . But , as the Doctor points out , not for long , for the Cyberships arrive , and Cybermen starting flying through space , towards the station . The Doctor tells Jessop that he needs to evacuate the station , as this could be the only chance to get everyone to safety , especially with the helix collapsing into a black hole . While Jessop gives the evacuation order , the Doctor talks to Gabby . The Cybermen were already here , planning the attack . But , the helix ' s sudden mutation means something else is going on here . Right now , they need to plot a safe route for Cindy and Akiyama to get back to Central Control . While Gabby does this , the Doctor overhears Jessop talking to another officer . The civilian personnel have been safely launched from the station and into the corridor . However , the Cybermen have trashed the lower docking ring . There are no escape ships left for the officers to use . The station shakes , as the Cyberships ram into it . This baffles the Doctor , as the Cybermen aren ' t acting logically . Then it hits him . There is no Cyber - virus . It ' s the white energy , which has infected the Cybermen . The Doctor does a deep scan of the collapsing helix , and finds that it ' s not becoming a black hole , but a white hole . Streams of time distortions are emanating from the hole , reaching out for the station , even accounting for the station ' s continual drift . There is an intelligence within the hole . The Doctor tells Jessop that he and his crew need to evacuate now . Since there are no escape ships , the crew will have to use the collection probes . The Doctor will use the station ' s power beam to push the probes through the corridor , allowing them to safely arrive at Ultima Tarsus . They should also destroy the station , so that the Cybermen can ' t use the corridor . The Cybermen were planning on taking over the station to use as a platform to stage an invasion of Ultima Tarsus . However , their plan was ruined by the white energy . Jessop and his crew need to make it back to Ultima Tarsus , to inform people about what happened here , so something like this can ' t happen again . Jessop agrees and begins working on the evacuation , and priming the station to self destruct . Gabby then reports a problem . The increasing number of Cybermen is limiting the options she can use to safely guide Cindy . The Doctor points out that they can go through the vacuum core . But , the core is where the energy beam is generated and there ' s no air in there . Cindy hears this and tells the Doctor that she hates him . The Doctor ignores this and tells Cindy to go through the core . Outside the core , Akiyama gives Cindy a cube , containing a self - enclosing E - Suit . All she has to do is tap the cube to her chest and the suit will form around her . As Akiyama begins explaining what will happen when they open the access hatch , Cindy puts on her suit . She then notices the Cybermen behind Akiyama and tries to warn her . But , it ' s too late , as a Cyberman grabs Akiyama , infecting her . Her suit cube files out of her hand and into Cindy ' s . The Doctor tells Cindy to not let the Cybermen touch her . She tosses the cube at the Cybermen , causing the lead one to stumble and slow down the others . However , the infected Akiyama grabs Cindy ' s ankle , just before Cindy opens the access hatch , and everyone is blown into the core . The Doctor orders Gabby to go get Cindy and to take her back to the TARDIS , without removing Cindy ' s suit . The Doctor heads over to Jessop and his crew , who have boarded a collection pod . Jessop thanks the Doctor for his help , before launching the pod . The Doctor then re - aligns the energy beam , pushing the pod safely through the corridor . The Doctor runs back to the TARDIS , noticing that the white hole has begun consuming the local space . At the TARDIS , he meets Gabby and Cindy . To his surprise , Cindy isn ' t infected . With no time to ponder on this , the trio quickly get inside the TARDIS and dematerialise , seconds before the station self destructs . The TARDIS is unable to get away , however , as one of the white hole ' s tendrils grabs onto the ship . As the Doctor ponders over everything , someone or something starts knocking on the door , which the Doctor proclaims to be impossible . Part four : The Eleventh Doctor . Inside the white void , the Eleventh Doctor confirms that there ' s nothing outside the TARDIS . Alice comments on it , giving the Doctor an idea . Even nothing has to have some substance , a point of origin . Scanning again , the Doctor detects a pinhole anomaly , so small that it ' s almost undetectable . The Doctor decides to fly the TARDIS through the anomaly , but that requires for him to shrink the TARDIS ' s external dimensions to do so . Despite Alice ' s protests , the Doctor goes through with it . On the other side , the TARDIS returns to normal size as it lands on a planet . Checking the console , the Doctor is shocked to discover where they landed . They are on Gallifrey , in the ancient past . Alice suggests that they should leave , but the Doctor reveals that the fluid links were destroyed . They need mercury to repair the TARDIS , and they can only get some from outside . Since they are on Gallifrey , the Doctor must not interfere with events , so the two will have to lay low . To prevent the TARDIS from being discovered , the Doctor sets up a dampening field and moves the ship to a house the two rent . Since he can ' t get the mercury , the Doctor spends his days checking over the other systems on the TARDIS , noting that the TARDIS is strangely exhausted from its trip through the micro - conduit . One day , the Doctor decides to check out a trading post in the Higher City , that dealt with secondhand scientific equipment , with the hope it might have something he can use . As they pass near the TARDIS shipyard , they find themselves in a time loop , but not a powerful one , as the Doctor is able to shield both himself and Alice from the effects with his sonic screwdriver . The two investigate to discover a group of scientists attempting to use a D - Bubble Fluxer to imprint one of the first TARDISes with larger interior dimensions . However , the time capsule has gone out of control , and is attacking and consuming the scientists . Using his screwdriver , the Doctor has the time capsule focus on him . He speaks to it , calming it down , and resulting in it releasing the scientists it has captured . He gives the scientists some advice and asks for some spare fluid links . The scientists ask who he and Alice are , so he introduces them as " Alice and the other one " . The Doctor and Alice try to come up with a name for him to use , before the Doctor decides to have everyone call him " Theta - Sigma " . Watching all this from a balcony is Rassilon , who orders Prefect Sarkis to bring Theta - Sigma to him . In his office , Rassilon studies the Doctor ' s screwdriver , noting how sophisticated it is . He also has the distinct feeling he has met the Doctor before . The Doctor denies this , stating that he is a humble inventor from the cheese - making quarter of the Lower City . Rassilon isn ' t fooled . The Doctor is clearly a Level 7 Evolved Time Sensitive , just like Rassilon is . Rassilon asks the Doctor how he was missed by the census . The Doctor reveals it was because he put down making cheese as his primary skill , telling him to ask Alice to confirm this . This leads to Rassilon mistaking Alice to be the Doctor ' s wife . Rassilon asks the Doctor why he asked the scientists for fluid links . The Doctor makes a comment that the current use of Validium in the links is dangerous , and that they should use Mercury or Rubidium instead . Rassilon is impressed with the Doctor ' s knowledge and decides to have him become one of the test pilots . As the days go by , the Doctor helps the Gallifreyans develop the time capsules in ways that were unobtrusive or would have little impact on future developments . One day , a test flight is scheduled to occur . Three time capsules will be jumping days forwards and backwards in time . The Doctor has been selected as one of the pilots . He plans to move the time capsule to where the TARDIS is , and then use the capsule ' s fluid links to repair the TARDIS , allowing the duo to depart . Alice heads back to the TARDIS to wait for the Doctor . When she gets there , she finds a floating hypercube inside . The cube greets her , projecting the image of the Second Doctor . The Doctor tells Alice to warn his future incarnation to avoid piloting the Type 1 TARDIS at all costs . As Alice runs to the test chamber , the Eleventh Doctor is already there . He notes that the capsule assigned to him is the same one he calmed down before . Rassilon had done this on purpose , as he figured that the flight would go more smoothly , since the Doctor has a sort of bond with the capsule . The test commences and the first two TARDISes dematerialise successfully . However , when the Doctor tries to dematerialise his capsule , something goes wrong . Rassilon tells him to abort the flight , but it ' s too late , as the TARDIS vanishes after entering the Time Vortex . One of the scientists has determined that there was an extra dimensional bubble hidden in the capsule , likely left over from the first attempt to insert internal dimensions inside the plasmic shell . This second bubble was unstable . The moment the capsule entered the vortex , the bubble burst , causing a catastrophic dimensional breakdown . Alice runs into the room , asking where the Doctor is . Rassilon breaks the news to her . The Doctor is lost , forever . Alice collapses to the ground and cries . Part five : Special # 1 . River Song . River Song and Wildar are on a mysterious planetoid . River has a mining drone following her . River asks for ' charges ' , which Wildar is immediately confused about , but soon , the ground behind River explodes . She jumps around , throwing more charges down , exploding more of the ground and tossing Wildar around , eventually reaching the ' Dacha ' . River exclaims this , pleasured . Wildar , who had just fallen down into the pit River had just blown up , worries over his helmet being broken , though he slows as an army comes rushing towards him . A woman , Terra , after grabbing , and taking Wildar , makes him realize that they are speaking Silurian . Meanwhile , River Song is examining the Dacha . She calls for Wildar , with no response . Puzzled , she assumes the cave is too deep , and is blocking the signal . River climbs up to a vantage point , only to find various portraits of the Third Doctor , Ninth Doctor , Eleventh Doctor , and Twelfth Doctor , along with two TARDIS es . River orders the mining drone to find Wildar , while she goes to find more of the Dacha . Meanwhile , Wildar is translating the Silurian to himself , as they discuss Wildar being a corrupt human . Wildar is incredibly nervous . Soon , in front of him , he sees a Silurian . He is perplexed by his existence . Meanwhile , the drone is still flying to the dig site , when bits of an ' exploding asteroid ' pass the drone . River states confidently that it ' s an ' exploding asteroid that will endanger the planetoid ' . River spots a pot in the center of the room , which she assumes is the Dacha , when a voice rejects this , and confirms that they are the Dacha . The voice turns out to be from another Silurian . River swiftly points her gun at the Silurian . The Silurian asks for help , in exchange for sparing Wildar , but River denies , claiming that she ' s not a ' saves everyone ' type . Warriors ambush River , encircling her . Meanwhile , Wildar is in a pit , with a large dinosaur . Many people watch , cheering . River jumps down to help Wildar , and she finds out that Wildar has no charges left , and he didn ' t bring " the cutting laser " . River starts to run , claiming that " she hates it when it ' s easy " . The Fourth Doctor and Romana . While preparing for an evening out in Paris , the Fourth Doctor and Romana discover a rift in the multiverse and materialize on a Kroton ship , and the Doctor is immediately puzzled at the Krotons ' relative level of power compared to his past experience with them . His confusion increases when the Krotons are attacked by Quark s , followed by another attack from the United Confederation of Ogron s . Having retreated to the TARDIS , the Doctor broadcasts a message to all three attacking fleets , confirming that they originate from alternate universes , speculating that these fleets originate from worlds where the Dalek s do not exist as the Daleks would have otherwise destroyed these three races to prevent them achieving this power . When the other fleets ask why the Daleks do not rule this universe if they are so powerful , the Doctor explains that this is because of him defeating them , and Romana then adds that the Doctor is actually the least dangerous of all Time Lords . Faced with this revelation , the fleets retreat back into the rift , but the Doctor takes the TARDIS in after them to find out what caused this attack in the first place . Part six : The Twelfth Doctor . Faced with the ' possessed ' Kate , Osgood , and UNIT forces , the Doctor realises that the energy possessing them does not affect time - travelers , prompting him to order his companions to retreat to the TARDIS to figure out their next move . Once inside the ship , he realizes that they have arrived in the TARDIS of the Tenth Doctor , who is joyfully reunited with Jenny before she identifies the Twelfth Doctor as his future self . As Gabby and Cindy explain regeneration to Bill , the two Doctors deduce that the white energy infecting the world is the energy of anti - time , which was brought here by Jenny ' s bowship . Deciding to analyse the bowship directly , the Doctors and Jenny evacuate the TARDIS in an escape pod , but are confronted by a mass of possessed students before those students are knocked out by the Ninth Doctor . The Ninth Doctor begins to explain that he was instructed to come here by their fourth incarnation , but his explanation is interrupted when the anti - time energy concentrates into a massive rift in the sky above the three Doctors . Part seven : Special # 2 . River Song . River Song goes her own way , even as the universe falls apart around her . Jenny . After leaving Messaline , Jenny ' s ship runs out of power , but she is eventually able to reconfigure her ship ' s shields into a hyperdrive generator . After jumping through space , she arrives on a planet orbited by a mysterious moon that appears every six months for a short time before it disappears again . After conducting work on the planet for six months , Jenny is able to get to the moon once it returns , where she finds and retrieves a bowship before discovering a rift in time . Alice . Refusing to believe that the Eleventh Doctor has died , Alice waits until nightfall , before sneaking into the lab and stealing one of the two remaining Type 1 Time Capsules , setting off to try to find the Doctor . Part eight : Omega . As the Doctors face the rift above the university , the Twelfth Doctor suggests that he , the Ninth and Tenth Doctors use their TARDISes to move Earth slightly to take it out of range of the rift . Unable to implement this plan immediately as their TARDISes have merged into one ship , the Tenth Doctor and Jenny head further into the ship to find a means of separating their ships while the others try to stabilize the rift , only to run into the Eighth Doctor and Josie Day coming out of another rift . After the Eighth Doctor explains that the other Doctors have become trapped on the other side of the rift , the Ninth , Tenth and Twelfth Doctors depart in Jenny ' s bowship while the Eighth Doctor remains with the companions on Earth to try and contain the situation . Travelling through the rift , the three Doctors briefly make contact with their other eight selves in the rift before identifying the source of the anomaly as the Eleventh Doctor , merged with the Type One TARDIS . Entering the TARDIS , the Doctors learn that their other self has become trapped outside reality after the proto - TARDIS panicked , but when he linked himself to the TARDIS ' s telepathic circuits to try and convince it to return to the universe , the TARDIS instead chose to try and destroy the universe due to its perception of the universe ' s chaotic state . In order to convince the Type One TARDIS to stop , the Doctors link their TARDISes to the other ship , the TARDIS ' s own perception of the universe helping its predecessor recognise that its initial perception was wrong . With the rift ended , the Doctors return to the university , the Ninth and Tenth Doctors agreeing to help the Eighth and Eleventh Doctors return to their TARDISes after they repair Jenny ' s ship , while the memories of all non - Time Lords of these events begin to fade so that even Bill and Nardole do not remember what has just happened .