when does the doctor gave rose his clone
Journey's End (Doctor Who) In the dénouement of the episode, the Doctor parts ways with his companions: Sarah returns home to her son Luke; Martha and Mickey leave with Jack; and the Doctor returns Rose and Jackie to the parallel universe they were trapped in, in "Doomsday". The Doctor has the other Doctor stay in the parallel universe for committing genocide and to requite Rose's love, since the second Doctor is part human. That means he has only one heart and can't regenerate, and will grow old and die along with Rose. After departing, Donna's human mind becomes overwhelmed by the Time Lord knowledge and starts to deteriorate. To save her life, the Doctor is forced to wipe her mind against her wishes, and explains to her mother, Sylvia (Jacqueline King), and grandfather Wilfred Mott (Bernard Cribbins) that Donna must never remember him or anything that they did otherwise she will die. As the Doctor leaves, Wilfred promises that he will never forget the Doctor on his granddaughter's behalf.
Twelfth Doctor Capaldi has previously appeared playing other roles in the Doctor Who franchise. He portrayed Lobus Caecilius in the 2008 episode "The Fires of Pompeii" and John Frobisher in Children of Earth, the 2009 serial of the Doctor Who spin-off Torchwood.[3][18] Moffat has stated that he plans on explaining over time why there are three characters in the Doctor Who universe with the same appearance; his predecessor Russell T Davies had once explained to him a theory for the first two, and upon Capaldi's casting assured Moffat that the explanation would still work.[19] This situation was alluded to in "Deep Breath", when a confused Doctor is reminded of Caecilius when he examines his face in a mirror.[20] In "The Girl Who Died", it is explained that the Doctor chose Caecilius' face to remind himself that he is the Doctor, and that he can always save people.[21] While not explained in the episode, Moffat later said that he also shares a face with John Frobisher as Frobisher is Caecilius's descendant, and represents the end of Caecilius's bloodline, referencing the Doctor's "eternal battle with doom and destiny."[22] Capaldi's casting marks the second time an actor has previously appeared in the series and then been cast as an incarnation of the Doctor, the first being Colin Baker.[23]