<P> The 2007 Christmas special sees the Doctor and a waitress , Astrid ( Kylie Minogue ) , save the Earth from the impending crash of the starship Titanic ; Astrid dies heroically , and the Doctor encounters Wilfred Mott ( Bernard Cribbins ) for the first time . In the 2008 series première episode , the Doctor is reunited with Donna Noble , Mott 's granddaughter , who becomes his regular companion . In `` Planet of the Ood '' , the alien Ood prophesy the Tenth Doctor 's demise . Martha accompanies them for three episodes ; in two , the Doctor battles the alien Sontarans , and last of which sees him become a father of sorts to Jenny ( Georgia Moffett ) , in `` The Doctor 's Daughter '' . He meets archaeologist and future companion River Song ( Alex Kingston ) for the first time from his perspective in the two - parter `` Silence in the Library '' / `` Forest of the Dead '' ; she dies , but he stores her consciousness to a hard drive to live on forever , after accepting that one day she will come to mean a lot to him . After Donna encounters Rose in a parallel world in `` Turn Left '' , the Doctor realises that Rose 's words to Donna -- `` Bad Wolf '' -- must herald the end of the world . In finale episodes `` The Stolen Earth '' and `` Journey 's End '' ( which cross over with spin - offs Torchwood and The Sarah Jane Adventures ) , the Doctor and Donna reunite with former companions Rose , Sarah Jane , Martha , Jack , and Mickey to save the universe from Davros ( Julian Bleach ) , the creator of the Daleks . The Doctor was fatally wounded during the event , aborting in mid-regeneration to maintain his current self while transferring the residual energies in his previously severed hand . This resulted in a metacrisis that created a half - human Doctor who would live with Rose in the parallel universe while imbuing Donna with a Timelord 's mind , forcing the Doctor to erase his companion 's memories to save her life and leaving her with her family . A Doctor Who Prom mini-episode , `` Music of the Spheres '' , features a lone Doctor composing his musical Ode to the Universe before being interrupted by the small alien Graske ( Jimmy Vee ) . </P>
<P> The 2007 Christmas special sees the Doctor and a waitress , Astrid ( Kylie Minogue ) , save the Earth from the impending crash of the starship Titanic ; Astrid dies heroically , and the Doctor encounters Wilfred Mott ( Bernard Cribbins ) for the first time . In the 2008 series première episode , the Doctor is reunited with Donna Noble , Mott 's granddaughter , who becomes his regular companion . In `` Planet of the Ood '' , the alien Ood prophesy the Tenth Doctor 's demise . Martha accompanies them for three episodes ; in two , the Doctor battles the alien Sontarans , and last of which sees him become a father of sorts to Jenny ( Georgia Moffett ) , in `` The Doctor 's Daughter '' . He meets archaeologist and future companion River Song ( Alex Kingston ) for the first time from his perspective in the two - parter `` Silence in the Library '' / `` Forest of the Dead '' ; she dies , but he stores her consciousness to a hard drive to live on forever , after accepting that one day she will come to mean a lot to him . After Donna encounters Rose in a parallel world in `` Turn Left '' , the Doctor realises that Rose 's words to Donna -- `` Bad Wolf '' -- must herald the end of the world . In finale episodes `` The Stolen Earth '' and `` Journey 's End '' ( which cross over with spin - offs Torchwood and The Sarah Jane Adventures ) , the Doctor and Donna reunite with former companions Rose , Sarah Jane , Martha , Jack , and Mickey to save the universe from Davros ( Julian Bleach ) , the creator of the Daleks . The Doctor was fatally wounded during the event , aborting in mid-regeneration to maintain his current self while transferring the residual energies in his previously severed hand . This resulted in a metacrisis that created a half - human Doctor who would live with Rose in the parallel universe while imbuing Donna with a Timelord 's mind , forcing the Doctor to erase his companion 's memories to save her life and leaving her with her family . A Doctor Who Prom mini-episode , `` Music of the Spheres '' , features a lone Doctor composing his musical Ode to the Universe before being interrupted by the small alien Graske ( Jimmy Vee ) . </P>
when did the tenth doctor regenerate into himself
when did the tenth doctor regenerate into himself
`` Journey 's End ''
`` Journey 's End ''