Doctor Who's regeneration is one of the most complicated and controversial aspects of the series. When it starting time premiered dorsum in 1963, the concept of regeneration was not considered but following William Hartnell'due south departure, the BBC invented regeneration in order to keep the fan favorite series going. Notwithstanding, as the serial connected on in 2005, regeneration became tricky as the Physician started in their 9th regeneration, leaving room for only two more actors earlier the 12 regeneration wheel expired. While the showrunners found a way to expand the cycle, assuasive for more than actors to take on the office, there was 1 actor that got away with property two regenerations.

Series two introduced the 10th incarnation of the Dr. played past David Tennant. The fresh faced histrion was perfect for the function, bringing in thousands of viewers dorsum calendar week after week to see him have on the timeline. Unfortunately, Tennant's time was coming to an end by the fourth dimension the fourth series was ambulation, giving audiences a few more episodes and four specials to say cheerio.

In the fourth series' last episodes, Earth was under assail past Daleks, and it was up to the Doctor and his friends to stop them, along with some help from Rose Tyler, who spent the better function of 2 years living in an alternate dimension. Excited to exist reunited with her, the Doctor and Rose ran into each others' arms, merely before they could reach, the Doctor was shot past a Dalek.

His half-expressionless body was brought dorsum into the TARDIS by Jack, Rose and Donna, who prepared themselves to come across a new incarnation. Halfway through his regeneration, the Md threw the remaining energy into his arm, which was detached early when Tennant get-go regenerated. This immune the Doctor to heal himself without having to get through a total change, which was great news for Rose and millions of viewers who were not set to say goodbye.

Despite merely using a regeneration to heal himself, this deed counted equally an actual regeneration, making Tennant not simply the 10th Dr., but also the 11th. This fact was proven past the actual 11th Doctor, Matt Smith, when during the stop of his ain life in the 2013 Christmas special "The Time of the Md" he revealed to Clara Oswald that this life was his terminal, mentioning how the 10th Physician wasted a regeneration, making him the twelfth regeneration.

While that could be disputed as merely a one-half regeneration, showrunner at the time Steven Moffat introduced the War Medico in the 50th anniversary special, further solidifying the idea that Smith was the 12th and final Doctor in the current regeneration set up. Thankfully, "The Time of the Doctor" gave the Fourth dimension Lord a whole new set of regenerations that they could utilise, which gave audiences Peter Capaldi and Jodie Whittaker, besides as the possibility to keep the show running for another 50 years.

Recently, Jodie Whittaker announced her desire to leavePhysician Whoand pass on the part to someone else. Every bit sad as this news is, audiences are excited to notice out who could take on the role after Whittaker, with a few possible contenders including Michaela Coel, Hugh Grant, Olly Alexander or Jo Martin. However, with the return of Series 1-4 showrunner Russell T. Davies, fans are trying to slip a familiar name into the pot -- Tennant.

The Doctor has proven they can choose their face, every bit the 12th Doctor revealed he chose the face he did because information technology reminded him of a human he saved. This is built on in the 50th anniversary when the Doctor meets the Curator who resembles the fourth incarnation, maybe hinting at the Doctor retiring with that face subsequently down the line, as the Curator mentioned that the Doctor would find himself revisiting a few erstwhile, favorite faces.

Because everything Whittaker'south Dr. has gone through over the concluding 3 series, including the revelation that the Doc is "the timeless kid," a beingness from an alternate reality that possessed regeneration and had it stolen by Gallifreyan scientist Tecteun for the evolvement of her species, it would be possible for the Dr. to determine to put a new on an sometime face subsequently thousands of years.

Information technology would also help with the awkward phase of having a new showrunner and a new Doctor starting out and trying to figure out the specific language of the new run, but if Davies teams up with Tenant, the duo could build onto what they had washed before. However, if Tenant does not cease up condign the 14th Doctor, long fourth dimension fans ofDoctor Whoknow that Davies will exercise everything he can to continue the serial unique and lively.

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