Donna ' s World Donna ' s World was , according to the Tenth Doctor , a " great big parallel world " — although parallel worlds were normally sealed off , Donna Noble had such a world " created around [ her ] " by the Time Beetle , one of the Trickster ' s Brigade . This was unusual , as most times when the Brigade changed time , the universe just compensated around it . In this world , Donna turned right instead of left while deciding which of two different job interviews to attend . As a result , the Tenth Doctor never met Donna and died underneath the Thames on Christmas Eve 2007 . This meant that he also never met Martha Jones . These events resulted in devastating effects for Earth . Using the surface technology of the Doctor ' s TARDIS , Donna travelled back in time from 2009 to make her younger self turn left again . According to both the Doctor and Donna , this world subsequently ceased to exist . ( TV : " Turn Left " ) History . While on the planet Shan Shen , Donna was unknowingly fitted with the Time Beetle , one of the Trickster ' s Brigade . A fortune teller selected a point in her life where making a seemingly random choice had enormous ramifications . On Monday 25 June 2007 , Donna had to make a choice between two jobs . The moment she chose between the jobs was at a junction on Little Sutton Street . Her agency had offered her a contract with H . C . Clements , which while temporary , was posh and in the centre of London , which Donna enjoyed . Her mother , Sylvia Noble , had got her a job opportunity to become the personal secretary of Jival Chowdry , owner of a photocopying business . Although this would be a permanent job , Donna found it less interesting . While driving and in discussing the dilemma , Sylvia pressured her into turning right towards Griffin ' s Parade to stop by Jival Chowdry for a chat . While in the regular world Donna ignored her mother and turned left towards the Chiswick High Road , here she turned right , resulting in her taking the PA job . ( TV : " Turn Left " ) On Christmas Eve 2007 , the Tenth Doctor tracked down the Empress of the Racnoss to the Torchwood base underneath the Thames Flood Barrier and blew it up , causing the Thames to be drained into the abandoned Torchwood base . ( TV : " The Runaway Bride " ) Although he succeeded in defeating and drowning the Racnoss and its offspring , the Doctor drowned with them . For some reason , he didn ' t regenerate . It was speculated that he drowned too fast to regenerate . His body was retrieved by UNIT soldiers and his TARDIS was salvaged from under the Thames , later being sent to a UNIT base in Leeds . Donna stumbled across Rose Tyler , who arrived on the scene too late to do anything . ( TV : " Turn Left " ) In 2008 , the Judoon HO scooped the Royal Hope Hospital to the Moon to find a Plasmavore criminal and her Slab accomplices . Although they found and killed the alien criminals , the Plasmavore had already armed the MRI . ( TV : " Smith and Jones " ) Sarah Jane Smith , Luke Smith , Maria Jackson , and Clyde Langer , who had been in the hospital when it was transported , disarmed the MRI , but they died , along with the rest of the hospital , when their oxygen ran out . The only survivor was Oliver Morgenstern , who was passed the last oxygen tank by medical student Martha Jones , who gave up her life to save him . Rose visited Donna and advised her to persuade her family to spend Christmas some place other than London . On Christmas morning , a replica of the " Titanic " crash - landed onto Buckingham Palace . It destroyed the Greater London Area and flooded the whole of Southern England with radiation . Donna ' s family , who did decide not to stay in London for Christmas , having won a luxury getaway in a raffle , watched the events on television and were able to see the mushroom cloud of the explosion from a distance . Britain went under martial law in order to deal with the crisis caused by the nuclear explosion . Many citizens fled to France , until France closed its borders . The United States promised fifty billion pounds in financial help for Great Britain but this plan was abandoned when in 2009 , sixty million Americans were killed and fully converted into Adipose children . ( TV : " Turn Left " ) The Sontaran s activated the ATMOS devices in the cars to convert Earth into a breeding ground . ( TV : " The Sontaran Stratagem " / " The Poison Sky " ) The Torchwood Three team , Captain Jack Harkness , Gwen Cooper and Ianto Jones , worked to stop the scheme . The team destroyed the Sontaran flagship and successfully reverted the atmosphere to its previous state , but Gwen and Ianto died in the attempt ; Jack , being immortal , survived and was captured by the Sontarans and transported to Sontar as a prisoner . Britain was largely unaffected due to its poverty and hence its lack of petrol . Rose once more appeared to Donna , telling her that Donna knew the Doctor and travelled with him " in a different world " , and that Donna was " meant to be there " under the Thames — the Doctor needed someone to stop him and save his life , and that was Donna . Rose asked Donna to come with her . Donna refused , but Rose told Donna that she will agree to come along in three weeks time and that she was going to die . Rose subsequently disappeared . Roughly three weeks after the Sontaran invasion , the British government made a new law ( " England for the English " ) forcing all non - British citizens in Britain to go to " labour camps " . Donna ' s grandfather Wilfred lamented that labour camps was " what they called them last time " , and " it ' s happening again . " ( TV : " Turn Left " ) In the Doctor ' s world , as a result of Davros ' reality bomb , ( TV : " Journey ' s End " ) also referred to as " the darkness " , ( TV : " Turn Left " ) using the rift at the heart of the Medusa Cascade to blast the bomb ' s Z - Neutrino wavelength into " every dimension " , ( TV : " Journey ' s End " ) " every single universe " was in danger of being destroyed . ( TV : " Turn Left " ) Dimensions started to collapse , destroying everything ; not just in the Doctor ' s world or the world Rose was in , but " the whole of reality " . Even the Void was dead . ( TV : " Journey ' s End " ) Rose was " pulled across from a different universe " because of this . ( TV : " Turn Left " ) With UNIT ' s help , Rose scraped off the surface technology of the TARDIS and planned to use a Lodestone to bounce chronon energy into the centre of a circle of mirrors , controlling the destination to send Donna back to Monday 25 June 2007 . UNIT and Rose sent Donna back to the point where Donna made her decision . According to Rose , Donna had to make her past self turn left instead of right at the point where she decided whether to follow her mother ' s advice or her own instincts on Little Sutton Street . Donna arrived in 2007 , but too far away from her past self to directly influence her ; instead , she orchestrated an accident by stepping out in front of a lorry , which blocked traffic and forced the earlier Donna to turn left . Just before Donna ' s death , Rose appeared and whispered a message for her to give the Doctor . Donna woke up on Shan Shen , and the Time Beetle was forced off of her back . The fortune teller ran away , questioning what Donna would become . Both the Doctor and Donna believed that the world created by the Time Beetle ceased to exist . Donna couldn ' t remember much of her world , " like when you try and think of a dream , and it just sort of goes " ; the Doctor stating this was because nothing Donna experienced happened . However , Donna remembered Rose telling her that the Doctor thought she was brilliant . Not knowing Rose ' s name , Donna told the Doctor about the blonde woman at the lorry who said to warn the Doctor about the end of the universe with two words : " Bad Wolf " . ( TV : " Turn Left " ) Aftermath . On the " Crucible " in the Doctor ' s world , Donna prevented the reality bomb from ever being detonated by closing all Z - Neutrino energy loop s using an internalised synchronous back - feed reversal loop . The collapse of dimensions closed up again because of dimensional retroclosure . ( TV : " Journey ' s End " )