the fact David Tennant had watched and loved Davison's Doctor as a child. In parallel with the third series, Tennant lends his voice to the animated serial The Infinite Quest. The 2007 Christmas special, "Voyage of the Damned", sees The Doctor and a waitress, Astrid Peth (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 premiere episode of the fourth series (2008), "Partners in Crime", The Doctor is reunited with Donna Noble, Wilfred'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, entitled "The Sontaran Stratagem" and "The Poison Sky", The Doctor battles the war-hungry alien Sontarans, and last of which sees him become a father of sorts to Jenny (Georgia Tennant), 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" and "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 results in a metacrisis that creates a half-human Doctor who would live with Rose in the parallel universe while imbuing Donna with a Time Lord's mind, forcing the Doctor to erase his companion's memories to save her life and leave 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). In lieu of a 2009 series, Tennant appears