Alternate timeline ( Father ' s Day ) In an alternate timeline , Peter Tyler never died in a car crash . Instead , his daughter , Rose Tyler , used the Ninth Doctor ' s TARDIS to go back in time and save his life . ( TV : " Father ' s Day " ) History . Witnessing the event . Initially , Rose asked the Doctor to take her back to the day that Pete died , 7 November 1987 , so she could be there with him , given no one was until the ambulance arrived , by which time he had already died . The Ninth Doctor agreed . The pair witnessed as Pete exited his car and was run over by a young driver , who quickly sped away in panic . However , Rose was distraught at witnessing the event , running away , unable to will herself to be with him . She confessed her regret to the Doctor , desiring to try again . ( TV : " Father ' s Day " ) Interfering . Reluctantly , the Doctor took Rose back to when her father died one more time . They waited out of sight from their past selves , who were still witnessing the event . The Doctor informed Rose they could not risk another return and must wait for their past selves to run off before Rose could intervene . However , Rose impulsively ran out , in front of her past self and saved her father ' s life , pushing him out of the way . The effect of such a change caused the Doctor and Rose ' s past selves to disappear . Rose and the Doctor then accompanied Pete into his house . Once alone , the Doctor chided Rose for her actions , remarking that her change to time would lead to catastrophic results . He eventually left , claiming he was leaving her there . Angered , Rose dismissed his threat and spent the day with her father , getting ready for the wedding he was meant to go to had he not died . They arrived at the wedding , where the guests present revealed they had lost contact with others meant to come . People around the world began to mysteriously vanish . In a park , a young Mickey Smith fled after the other children also disappeared . Rose and others found their phones would only repeat the same message over and over when they tried to ring people : " Watson , come here , I need you , " the very first thing said over a telephone by Alexander Graham Bell . The Doctor , upon returning to his TARDIS , found the interior had been taken out of time . Realising what was occurring , he raced to the church . Rose also met her mother , Jackie Tyler , and her younger self , discovering her parents ' marriage was not as idyllic as her mother made her to believe . The Doctor arrived shortly after , saving Rose from a Reaper . The guests fled into the church , as its age acted as a shield against the reapers . However , it wouldn ' t last as the Reapers gained more power as they consumed more people . The Doctor guessed the only survivors on Earth were people like them in similar old buildings . Over time , the Doctor revealed to Rose that saving her father had enabled the Reapers to infest reality , where they would cleanse it of everything to fill in the void made by her saving Pete . However , he refused to let Pete die again , attempting to save everyone by using his TARDIS key to pull the TARDIS back into their timeline . However Rose accidentally touched her younger self , enabling a Reaper to enter the church . The Doctor then sacrificed himself and his TARDIS to destroy the Reaper , their last hope lost . The Reapers eventually consumed the whole world . ( TV : " Father ' s Day " ) Negation . Later , Pete noticed the car from earlier that day was stuck in a time loop , driving round the church only to vanish . He figured out that the only way to restore the timeline was to allow the car to run him over . He told Rose , having understood the Doctor had figured it out also , but tried to find another solution to spare Rose losing her father again . After saying goodbye to Rose and Jackie , Pete ran out into the road , avoiding the Reapers and allowed the car to kill him . As such , a new timeline was created . This time , Rose was by her father as he died , outside the church rather than his house . The driver stayed in the new timeline , allowing everyone to know who he was . ( TV : " Father ' s Day " ) Rose later told Jackie she changed history so she was at her father ' s side as he died , rather than not so as originally occurred , in an effort to prove to her mother how wonderful the Doctor was . ( TV : " The Parting of the Ways " )