and the woman recognised the Doctor on sight as well, but the Doctor's presence, regardless of incarnation, was expected. In "The Day of the Doctor", the War Doctor recognises neither the Tenth Doctor nor the Eleventh, initially assuming them to be future companions. Likewise, earlier on, when the Tenth and Eleventh Doctors first meet, the Tenth Doctor does not recognise his successor at first, but after the Eleventh Doctor's reaction upon seeing him, he is quick to realise who the Eleventh Doctor is. In "Dark Water", the Twelfth Doctor is unable to recognise the Master until she reveals her identity. In "Spyfall", the Thirteenth Doctor is unable to recognize the Master until he tells her. In "Turn Left", the Tenth Doctor is killed in his own rampage against the Racnoss without Donna to stop him and ultimately save his life. A UNIT soldier speculates that he died "too fast for him to regenerate". In "The Impossible Astronaut", a future version of the Eleventh Doctor is shot, causing him to begin his regeneration cycle. He is shot again before the regeneration completes, causing him to die instantly. However, in "The Wedding of River Song", it is revealed this was a shape shifting android the Doctor used to fake his death, making this questionable. In cases of non-fatal injury, Time Lords who have recently regenerated can use left over cellular energy to heal and even regrow severed limbs, as seen in "The Christmas Invasion" where the Tenth Doctor regrows a hand. Also seen in "Journey's End", is the apparent ability to siphon off regeneration energy in order to cancel the effect of changing appearance; which requires them to have a "bio-matching receptacle" (in this case the Doctor's severed hand), which is usually impractical. However, this "non-regeneration" was revealed as "counting" towards the Doctor's twelve possible regenerations during the events of "The Time of the Doctor". In "The End of Time", the Tenth Doctor was able to postpone his regeneration long enough so that he could travel in time and space to see his past companions for one last time before he regenerated. The Fifth Doctor also showed a similar ability in his final televised story The Caves of Androzani. Toward the end of episode 3 he is seen, apparently, fighting off the effects of an impending regeneration so he can return to Androzani Minor to save his companion Peri. Time Lords appear