Doomsday ( TV story ) Doomsday was the thirteenth and final episode of series two of Doctor Who . It marked the final appearance of Rose Tyler , played by Billie Piper , as a regular companion . It also ended on a seasonal cliffhanger with the unexpected introduction of Catherine Tate as Donna Noble . Narratively , the destruction of Torchwood London seeded the way for the spinoff " Torchwood " , where Torchwood Three eventually became all that remained of the Institute . The Cult of Skaro escapes at the climax of this episode , starting a string of Dalek stories which eventually concluded with the reestablishment of the Daleks as a race beyond survivors of the Time War in " Victory of the Daleks " , four years later . " Tardisode 13 " occurs during the events of this episode , when the battle reaches a climax . It is the last of the Tardisode series , ending with the series 2 finale . Synopsis . A secret order of Dalek s emerge and the Cybermen from Pete ' s World make their way to Torchwood Tower . As the two deadly forces fight over Earth , the Tenth Doctor realises that in order to stop the threat , sacrifices will be made . Plot . Dr Singh , Mickey Smith and Rose Tyler are trapped in a sealed room within Torchwood Tower as the four Dalek s who have emerged from the void ship approach them , with a vaguely Dalek - shaped artefact following . As they cry out their intent to exterminate , Rose surprises them by calling out their name . She approaches the black Dalek and offers to tell them how she knows about the Daleks and the Time War if they keep them alive , with Mickey and Dr Singh playing along . The black Dalek decides that they are necessary and asks about the status of the artefact — which it calls the Genesis Ark . It orders the awakening to begin ( Dalek Jast proceeds to monitor the Ark ) and declares that the Ark must be protected above all else . The black Dalek , then asks which one of the three is least important . Rose refuses to answer , but Dr Singh volunteers , knowing he is of no importance compared to the two time travel lers . They ask him to kneel down and say they need to know everything they can . Dr Singh begins to respond but they say that speech is not required . Dalek Sec , Dalek Thay , and Dalek Caan place their plungers around his skull and stretch his brain . A few minutes later , his mutilated corpse drops to the floor . Rose yells at the Daleks that they didn ' t need to kill him , but they state they didn ' t need him alive either . The Cybermen hold Jackie Tyler , Yvonne Hartman , and the Tenth Doctor hostage . The Cyber - Leader demands to speak to the world leader . Yvonne tells the leader they don ' t have one , and the Cyber - Leader tells her they have one now . It interrupts all television to make a message in which it promises to convert all human s into Cybermen . There appear to be Cybermen in every home on Earth , and Cybermen are said to be on every landmass . However , despite the call for surrender , the British Army mobilises and soon fighting and fire have spread across the whole of London ( and by implication other places as well ) , with both sides taking losses . The Cyber - Leader is confused that humanity hasn ' t surrendered , to which the Doctor angrily snarls that mankind are not taking instructions ; the Cybermen are " on every street , you ' re in their homes , you ' ve got their " children " ! Of course they ' re gonna fight ! " The Cybermen then notice other lifeforms in the building and send Cyber units Ten - Six - Five and Ten - Six - Six to the Void Room to investigate . At the same time , the Daleks notice lifeform readings and send Dalek Thay to investigate . The Cybermen and the Dalek meet in the corridor outside the Void Room . The Doctor , Jackie , Rose and Mickey can see them both through video transmissions and the Doctor is visibly horrified to see the Dalek . The Cybermen ask that the Daleks identify themselves and the Daleks demand the same . Neither comply and there is a stand - off , which Mickey describes as " Stephen Hawking meets the Speaking Clock " . The Daleks accidentally slip up when Dalek Thay says that " Daleks do not take orders " , but recognise the Cybermen , comparing them to their own universe ' s Cybermen . The Cybermen and the Daleks exchange insults until the Cybermen offer to form an alliance with the Daleks to overtake Earth , and eventually upgrade the universe , together . The Dalek refuses and the Cybermen open fire to no avail and are easily exterminated . The Cyber - Leader warns Dalek Sec that he declared war on the Cybermen , to which he replies , " This is not war , this is pest control ! " Dalek Jast then spots the Doctor on the screen , and the Daleks register him as an enemy , but fail to recognise who he is exactly . Dalek Sec recognises that Rose ' s heartbeat has increased , causing Mickey to say , " Yeah , tell me about it ! " The Daleks demand to know who the man on the screen is . Rose tells them who he is and the Daleks move back terrified . Rose is amused that five million Cybermen are easy , but one Doctor has got the Daleks scared . After a brief conversation with the Doctor about Rose ' s safety , Jackie is dragged away to be upgraded along with Yvonne Hartman . The Doctor promises he will save Jackie and get her out alive before she is taken away . The Cyber Leader comments that the Time Lord is proof of how emotions weaken humans . The Doctor agrees , but then says that he quite likes hope , and in that instant a team with guns suddenly appear and destroy all Cybermen in the Breach Room . The leader reveals himself to be Jake Simmonds . The Doctor is shocked to see him here , since he is from a parallel universe . Jackie tells Yvonne that what is happening now is Torchwood ' s fault and she has brought death and destruction to the Earth . Yvonne is taken away , as she tries to remind herself that what she did was for ' Queen and country ' . The Cybermen sense that the Cyber - Leader has been killed and begin to download his files into another Cyberman unit . This gives Jackie the chance to escape down the stairwell . Meanwhile , the Doctor tells Jake that they cannot just hop from one universe to another . Jake shows the Doctor the disc - shaped devices they developed with their world ' s version of Torchwood , and before the Doctor can stop him , Jake transports the two of them . Jake explains that they found out what the parallel Torchwood was doing and the People ' s Republic took control . As the Doctor asks Jake to take him back , Pete Tyler steps out of the shadows , telling the Doctor that this is their world and for once , he is going to listen . Dalek Thay returns to the Sphere room , suggesting that they should concentrate on the Genesis Ark before attempting to battle the Cybermen . Dalek Sec orders the Daleks to begin the awakening and all four Daleks attach the ends of their manipulator arms to four spheres which are positioned on the Ark ' s four sides . Pete explains that they tried sealing up the Cybermen in the factories , but other people argued that the Cybermen were still people and needed help . As the debate went on , the Cybermen infiltrated the parallel Torchwood , found the Doctor ' s universe and vanished . The sheer mass of five million Cybermen is why it took them three years to cross while individuals could pop across in a second . Mickey reveals to Rose that he has one of the dimension - jumping devices , but it can only transport him , saying the Daleks won ' t need him or Rose . Rose proceeds to wonder aloud why the Daleks would build something they couldn ' t open ( having realised that the Daleks need a time - traveller ' s touch to open the Ark ) . Dalek Sec , having overheard the conversation , declares that the Daleks did " not " build the Ark , stating it is of Time Lord design , claiming the Ark is the last remnant of Time Lord society ( other than the Doctor and the TARDIS ) . When Rose asks what is inside , the Dalek only replies enigmatically , " The future . " Pete shows off his world , where Great Britain is apparently enjoying a Golden Age , and where Harriet Jones is President . However , ambient temperatures are rising and the ice caps are melting . Pete correctly surmises that it has to do with the breach ; the Doctor confirms that every time someone crosses over damage is done , and if it keeps up both worlds will fall into the Void . Pete believes the Doctor can close the breach , but when the Doctor says that doing so will leave the Cybermen and Daleks on his world , Pete replies that he is only interested in protecting his Earth . The Doctor points out there is a parallel Jackie who is still alive but Pete says that there are more important things at stake and asks the Doctor to help them . Revitalised by Pete ' s faith in him , the Doctor agrees to help . The Doctor , Pete and Jake cross back . The Doctor calls up Jackie on her mobile phone , telling her to keep a low profile in the stairwell . The Doctor takes Jake ' s rifle and modifies it so it can affect polycarbide , the skin of a Dalek . He then surrenders a " very good idea " unto the Cybermen ( using a piece of white A4 paper on a stick in place of a little white flag ) and the two sides work together . Dalek Sec demands that Rose activate the Ark , threatening Mickey ' s life . Rose steps forward to do so , but gleefully tells the Daleks how she met the Dalek Emperor and used the time vortex to turn him to dust . The furious black Dalek is about to exterminate her for this when the Doctor appears in the doorway . The black Dalek asks how the Doctor survived the Time War . The Doctor says that he did that by fighting on the front lines , whereas these Daleks fled . Rose tells the Doctor that these Daleks have names , a fact which the Daleks confirm by declaring each of their names respectively : Dalek Thay , Dalek Sec , Dalek Jast , and Dalek Caan . The Doctor realises that these four Daleks are members of the Cult of Skaro , a secret order above even the Emperor . The Cult ' s purpose was to think as the enemy thinks , to find new ways of killing , including daring to take on individual identities . When Mickey asks the Doctor about the Genesis Ark , the Doctor replies that he does not know what it does ; both sides had secrets . Dalek Sec gloats that Time Lord science will ensure the supremacy of the Daleks , and orders the Doctor to open the Ark . The Doctor laughs off the suggestion and produces his sonic screwdriver . He explains that , while it cannot kill , wound , or maim , it is very good for opening doors , a fact he demonstrates by using it to explosively open all the doors leading into the sphere chamber . The Cybermen enter and open fire on the Daleks using the modified energy rifles , temporarily disrupting Dalek Thay ' s shields and weapons and giving the Doctor and humans time to escape . However , the Daleks quickly adapt and regain control of their weapons and return fire without mercy , concentrating their attacks on the Cybermen . As the Doctor and the humans rush out of the chamber , Mickey is knocked into the Ark by a damaged Cyberman and his hand presses against its surface . After the Daleks easily exterminate the Cybermen , the Ark is primed , steam gushing from the bottom vents , but Dalek Sec says that it needs a space of thirty square miles to activate . The Daleks begin to escort it out of the chamber . The Doctor and the humans retreat towards the stairwell . Mickey apologises for his slip - up , but the Doctor tells him that he did them a favour because the Daleks would have destroyed the Sun in an attempt to open the Ark by force . Jackie is found by two more Cybermen who lurch forward to capture her for upgrading but are shot from behind by Pete , with the Doctor , Rose and Mickey following him . Jackie and Pete see each other for the first time and have an awkward exchange as their parallel counterparts are dead . Although Pete tries to rationalise that Jackie is not really his wife , the two end up running into each other ' s arms and embracing . The Daleks and the Ark move into the Torchwood storage area , battling another force of Cybermen . Some human soldiers break in and add to the chaos . The Doctor stumbles into the area as well , grabbing two magna - clamps before leaving . As the Daleks blast their way through all opposition , the new Cyber - Leader calls for reinforcements . Dalek Sec overrides the roof mechanism , and elevates upward with the Ark . As the Doctor and the others watch , the Ark opens above London and starts spinning , disgorging Dalek after Dalek . The Doctor realises that the " Time Lord science " Dalek Sec referred to was the fact that the Ark is bigger inside than outside : the Ark is a prison ship , containing millions of Daleks . As hundreds of Daleks line up in aerial formation , an army of heavily armed Cybermen appears and attacks the Daleks . The Daleks and Cybermen begin fighting all over the world , with the human race caught in the crossfire . Pete believes the situation to be hopeless , and prepares to escape back to his world while offering to take Jackie along with him . The Doctor , however , is more optimistic . Wearing his 3 - D glasses , he explains that it allows him to see that everything that has crossed the Void between universes has picked up background radiation from it : " Void stuff " . Since the Daleks and Cybermen have been hiding in the void , they will be saturated in it and will be pulled back into the Void if he re - opens the rift , which will then collapse in on itself and seal the breach between worlds . Rose , however , points out that they are covered in " Void stuff " too . The Doctor explains that he will open the breach here , but if Rose and the others go back to Pete ' s world , they will be safe . The Doctor will hang on to the magnetic clamps so he will not be pulled in . Rose realises that if the breach seals she will never be able to return , and refuses to leave the Doctor despite the prospect of never seeing her mother again . While Rose and Jackie argue about who is leaving , the Doctor and Pete slip the devices around their necks and Pete transports them all across . However , Rose reactivates her device and returns , telling the Doctor she will never leave him . Pete stops Jackie from returning too , telling her that every time they cross the breach they damage both worlds . Rose sets all the coordinates on the Void controls to six on the Doctor ' s instructions . As the Cybermen climb the stairs intending to use the breach to retreat to and retake Pete ' s world , they are met by a Cyberman with a female - sounding voice , that of Yvonne Hartman . She declares that they shall not pass and shoots them with an energy rifle . As she repeats that she did her duty for Queen and country , a tear of oil leaks from the duct below her left eye . The Doctor and Rose fix the magnetic clamps on the walls . When they open the breach , Dalek Sec senses the breach is active , deduce s the Doctor is behind it , and sends a squad of four Daleks to exterminate him . Rose and the Doctor pull the levers , activating the breach , holding on as tightly as possible to the clamps . Outside , the Daleks released from the Ark and even the Ark itself are drawn towards Torchwood Tower and are rapidly sucked into the breach . The Cybermen , still firing at the Daleks , are also pulled upward into the sky . However , Dalek Sec ( along with the rest of the Cult ) initiates an emergency temporal shift and escapes . The power lever on Rose ' s side begins to shift to the off - line position , threatening to abort the process while there are still Daleks left . Unable to reach her lever while still holding on , Rose lets go of her clamp to do so . She pushes the lever back up and power is restored , but Rose is left clinging on as the void tries to consume her . The Doctor yells at her to hold on . As the last of the Daleks fall into the breach , Rose can no longer hold on and lets go , flying towards oblivion . The Doctor screams in anguish , but at the last moment , Rose is saved by Pete who materialises in front of the breach , grabs her and vanishes again . The breach ripples , and seals itself leaving Rose trapped in Pete ' s world . On the parallel world , Rose beats the wall , sobbing hysterically , as Pete notes that his device no longer works . On both sides of the breach , the Doctor and Rose lean against the wall , resting their cheeks against it for a moment . The Doctor then walks away sadly , alone . Some time later , Rose has a dream where she hears the Doctor ' s voice calling her . Rose , Jackie , Pete and Mickey follow the voice to fifty miles outside Bergen , Norway , on the coastline of Dårlig Ulv Stranden , roughly translated to Bad Wolf Bay . There , an image of the Doctor appears ; he tells her that he found the last of the breaches , and is transmitting the signal by using the TARDIS to harness the power of a supernova , commenting that he is burning up a sun to say good - bye . Rose tells him that he looks like a ghost , and the Doctor increases the image of himself to maximum projection — making it look as if he is really standing there , but he regretfully tells Rose that he is still just an image , and that she cannot touch him . With only two minutes left , the two share their final farewell . Rose tells the Doctor that her mother is three months pregnant . At first , Rose jokes that she is now back working as a shop girl , but then reveals that she is with the parallel Torchwood , which has re - opened , as they could use her expertise with aliens . The Doctor smiles proudly and says , " Rose Tyler : Defender of the Earth . " The Doctor tells Rose that she is officially listed among those that died on that day . Rose tearfully asks the Doctor if she will ever see him again , and the Doctor replies regretfully , " You can ' t . " Breaking down , Rose asks what the Doctor will do , and he says he will go on , alone . Weeping , Rose tells the Doctor she loves him . As it is his last chance to do so , he begins to reply , " Rose Tyler . . . " but his image fades . Rose , still in tears , turns and runs back into Jackie ' s arms . In the TARDIS , the Doctor stands for a minute , lips still parted , about to mouth the word " I " and a single tear rolls down each cheek . He takes a deep breath to help him regain his composure , and regretfully starts to work the console again . Suddenly , he looks up to see a woman in a wedding dress standing in the console room . Dumbfounded , all the Doctor can repeat is , " What ? " , as the bride demands sharply that he tell her where she is and " what the hell " the place is . . .