[[DoctorWho http://tvtropes.org/pmwiki/pub/images/thenthdoctor.jpg]]
[[caption-width:228:Believe it or not, that's all the same guy.]]
-->'''Fifth Doctor''': ''I'm the Doctor, who are you?''\\
'''Tenth Doctor''': ''Yes, you are! You ''are'' the Doctor!''\\
'''Fifth Doctor''': ''Yes I am, I'm the Doctor.''\\
'''Tenth Doctor''': ''Ohh, good for you, Doctor! Good for brilliant ol' you!''\\
'''Fifth Doctor''': ''Is there something '''''[[FutureMeScaresMe wrong]]''''' with you?''
-->''DoctorWho'', "Time Crash"

Some element of a show's AppliedPhlebotinum causes a character's appearance and voice to change completely. On Speculative Fiction shows, this can be almost anything. On real-world shows, this is almost always MagicPlasticSurgery - which, on TV, works much better than it does in reality.

This is a catch-all for the recasting of a character using an in-continuity explanation. It takes its name from ''DoctorWho'', whose titular Doctor is an alien capable of "regenerating" into a new form whenever the lead role needs re-casting.

Compare to: JonasQuinn (which introduces a totally new character much like the old one), and TheOtherDarrin, aka SisterBecky (where the actor is replaced without explanation).
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!!Examples:

[[foldercontrol]]

[[folder: Film ]]

* ''Rogue Assassin'' had the whole point of the mystery of the titular Assassin having plastic surgery to remain unknown. [[spoiler: We don't actually see any of the titular Assassin's face and instead the one we THINK is the Assassin was actually his last target who took over his identity.]]
* The Oracle's actress exchange in ''TheMatrix'''s third movie gets a HandWave big enough to cover a small city.
* HeathLedger's [[AuthorExistenceFailure death]] was dealt with in his unfinished movie ''The Imaginarium of Doctor Parnassus'' this way. Johnny Depp, Jude Law, and Colin Farrell played his character in different dimensions.
* When George Lazenby replaced SeanConnery as JamesBond, the producers considered including a dialogue saying Bond underwent plastic surgery in order to fool his enemies, but then changed their minds to "[[TheOtherDarrin different, but doesn't need explanation]]".
** Other method: that JamesBond [[LegacyCharacter is a codename given to each new agent]]. It works if you think of Lazenby's Bond being the same as Sean Connery's, DiamondsAreForever [[DisContinuity never happening]] and then Roger Moore was a new agent. The dead wife was a part of his identity from the last one.
*** Moore [[ForYourEyesOnly visiting the dead wife's grave]] kinda screws this...
*** Wasn't she mentioned in LicenceToKill as well?
** One [[EpilepticTrees popular theory]] is that JamesBond is a timelord.
* Parodied in the animated film ''{{Bolt}}''. [[spoiler:When Penny decides to quit being an actor, the TV show she works for replaces her and explains her change in appearance as the result of reconstructive plastic surgery.]]
* Parodied in the 2008 ''GetSmart'' movie. Agent 99 is shown to have undertaken extensive plastic surgery after her cover was blown. She used to look like a 50 year old blond woman. Now, she's Anne Hathaway.
* Terry O'Quinn declined reprising the role as the titular AxCrazy in ''Stepfather III'' and was replaced Robert Wightman; the change in appearance is dealt with via a {{Squick}}y [[BackalleyDoctor backalley]] [[MagicPlasticSurgery plastic surgery scene]] at the beginning of the film.
* ''ArsenicAndOldLace'' features a clever parody of this: Jonathan Brewster has had Magic Plastic Surgery from his crazy doctor companion several times, but he only appears with one face (and one actor) in the movie.
** This coincides a bit with both AbsentActor and ExecutiveMeddling, as the whole gag of the character was that his [[MagicPlasticSurgery Magic Plastic Surgeon]] accidentally gave him the exact likelness of Boris Karloff... who played him in the Broadway production. As the production was still making money at the time the film was set to be produced, the stage producers wouldn't allow Karloff out of his contract long enough to shoot TheMovie, and so the film production had to make do with a heavily-made-up Raymond Massey.

[[/folder]]

[[folder: Live Action TV ]]

* ''DoctorWho'''s the Doctor, as mentioned above. Each new regeneration brought with it a new characterization, costume, and personality.
** The Doctor isn't the only Time Lord to get this treatment; The Master has had a number of onscreen incarnations, and Romana regenerated from Mary Tamm into Lalla Ward -- who, confusingly enough, had appeared alongside Tamm in a serial just before she took over the role. This got explained by Romana liking Princess Astra's appearance so much she decided to regenerate into her.
** Borusa, a Time Lord on Gallifrey, was in a different regeneration (a different actor) in each of the four stories he appeared in.
** This trope was also spoofed wonderfully in the unofficial 1999 DoctorWho comedy special "The Curse of Fatal Death," where the Doctor regenerates [[spoiler: 4]] times throughout the half-hour special. Particularly one moment [[spoiler: where the Doctor uses up three bodies in less than a minute all because he forgot to unplug a rather large deathray.]]
*** And don't forget that [[spoiler: the final regeneration was a woman!]]
** The Christmas Special for 2008 featured the Doctor seemingly meeting one of his future regenerations, played by David Morrissey, in jolly ol' England. Considering the news about the Eleventh Doctor, to be played by MattSmith, hit not long after, it should not be surprising that this was in fact a subversion. [[spoiler: Eleven isn't Eleven at all, but a man named Jackson Lake who accidentally had the Doctor's personality and memories stamped upon him after going through serious trauma]]. Still, it worked great in the previews and the episode itself.
** Though he's been shown to explicitly regenerate only once onscreen (two other times, he's just stolen bodies of other people), seven people have played The Master so far -- Roger Delgado, Peter Pratt, Geoffrey Beevers, Anthony Ainley, Eric Roberts, Sir Derek Jacobi and John Simm. (Pratt and Beevers played the same regeneration in two different stories, making the Master a rare case of a character to have been both Nth Doctor and [[TheOtherDarrin Other Darrin]]. This made possible by heavy make-up, as in those two stories the Master was supposedly close to the end of his final life and had degenerated into a visibly decaying near-zombie.)
*** [[spoiler: It looks like the Rani's going to finally get the treatment in the upcoming season of Doctor Who, as rumors are heavy that TheXFiles' Gillian Anderson is going to become the new Rani, having had Kate O'Mara as the constant actress in her previous two appearances.]]
* On ''{{Sliders}}'', Quinn Mallory's replacement by his non-identical counterpart from another universe, when Jerry O'Connell left the show, is half this and half JonasQuinn.
** On the other hand, third-season BigBad Rickman is replaced by a new actor after his first appearance, and this is explained as a side-effect of his vampiric medical condition: in his first appearance, his facial features change momentarily whenever he injects brain tissue from his victims. This transformation turns out to have a small but cumulative permanent effect as well. In reality, Roger Daltrey was simply too expensive to keep on as a recurring character.
* On ''MysteryScienceTheater3000'': Replacement of voice actors/puppeteers for the robots, as in most puppetry and animation, was usually unexplained. However, the difference in Tom Servo's voice from one actor to another was so severe, that it was given an on-screen nod as Joel replaced Servo's voice module. Similarly, in the eighth season Crow T. Robot was the only one who'd stayed on the satellite for five-hundred-odd years, and thus had gone slightly mad; any other vocal differences were given a HandWave in the tenth season when Joel (appearing as TheCameo) suggested that Crow had replaced the bowling pin that formed his mouth.
**This was also lampshaded in episode 905, where Mike cut himself on Crow, becoming a Were-Crow. In giving Mike the rundown of what being Crow would entail, Crow mentioned that "your voice is gonna change inexplicably every seven years or so." Of course, it was really 507 years... see {{MST3K Mantra}}.
***Is the above troper suggesting that Crow's voice couldn't possibly have changed in-continuity every seven years for the five-hundred and seven he was aboard? For all we know, he could've been on voice 72 by the time season eight rolls around.
* ''StarTrekDeepSpaceNine'' replaced Terry Farrell as Jadzia Dax with Nicole de Boer as Ezri Dax. It was already a well established part of the show's {{canon}} that the character of "Dax" was a symbiote that attached itself to a new humanoid host, thus explaining the new face and somewhat-different personality.
** This replacement is also a partial JonasQuinn, since the show established that while the symbiote carried its memories from host to host, the hosts themselves were distinct individuals with their own personalities.
** Interestingly, the episode "The Host" from ''StarTrekTheNextGeneration'' plays this trope completely straight with regard to the Trill symbiotes; however, as a result it contradicts greatly with ''Deep Space Nine'''s portrayal.
** What's never really explained is why the symbiosis commission would (A) allow a host who never went through the initiation process to keep her symbiote even though they were previously willing to kill to protect the secret that 50% of their population could be joined or (B) allow a Trill to reassociate COMPLETELY with her past life, including resuming an old romance, when this very thing was revealed to be a grave cultural taboo in a previous episode. It sort of boggles the mind.
*** Judith & Garfield Reeves-Stevens tried to justify the whole thing in a novel by saying that Ezri was a accidental passenger on the ship carrying the symbiote back to Trill, the person who was originally supposed to become the new host got [[strike:killed]] hidden away by a Dominion infiltrator, and Ezri had to become the new host.
*** The Cover-up your referring to was that someone blatantly and obviously (after the fact) unsuitable for joining was able to survive as a host about three times longer then the committee say he should have, Ezri being able to be a host wouldn't challenge anything, she was just luckily one of the few who could be joined, but never sought it. As to the re-association taboo that seems to only apply to romantic relation ships, and her and Worf [[spoiler: never actually resumed there relationship, just had a one night stand that neither probably ever mention to anyone, so the symbioses committee wouldn't know about it.]]
* In ''{{Smallville}}'', the recurring character Morgan Edge is initially played by Rutger Hauer, and after a near-fatal accident and MagicPlasticSurgery, he is played by Patrick Bergen, leading to this priceless quote:
-->'''Lex Luthor''': You can change your face, your hair, your voice... but not your DNA. You still sweat the same.
* In Series 1 and 2 of ''My Parents are Aliens'', Sophie Johnson was played by blonde Barbara Durkin. From Series 3 onwards, she was played by brown-haired Carla Mendonça, having 'got stuck' morphed that way.
* Holly, the A.I. from ''RedDwarf'', gave himself a sex change after Series Two; "she" remained a female character for the next three seasons. Somewhat {{squick}}y, in that the female version drools over men like an adolescent schoolgirl. Or maybe it was just Ace Rimmer, in which case [[EvenTheGuysWantHim it's understandable either way]]. (What a guy!)
** Less noticeable was the recasting of the android Kryten (with Robert Llewellyn replacing David Ross, who originally was to return but was unavailable). This was mainly achieved when the look of the series was entirely redesigned, with a greatly improved budget allowing for better costumes and prosthetics, plus the fact that Kryten was only in one episode previously. Llewellyn played the part very differently, with this being explained in an OpeningScroll as Lister rebuilding him but being unable to restore his personality, this was further explored in Series VIII Episode 2 "Back in the Red: Part 2" when Kryten's behaviour is 'reset' and his actions and mannerism noticeable revert to the 'Ross' Kryten (before being restored to his old new self).
* British children's comedy ''MikeAndAngelo'' had Angelo - an alien - go through a regeneration process into another actor that was a direct reference to ''DoctorWho''.
* Inverted on ''[[BabylonFive Babylon 5]]''; at the end of Season 1, Delenn uses an ancient machine to transform herself into a being with both human and Minbari characteristics, radically changing her appearance, but is still played by the same actress. (It gets weirder: the original plan was for Delenn to be a ''male'' Minbari, who became female in her transformation...and it was always going to be the same actress, with makeup, effects, and voice manipulation. That part didn't work and was scrapped before filming began.)
** The male makeup for Delenn is still in the pilot though, mostly in the jawline, the plan fell over at the voice manipulation, which couldn't be made to sound convincing.
****Technically, the movie Delenn wasn't male, the plan was to have the Minbari as hermaphrodites, and adjusting to being a distinct gender was to have been part of the change.
** ''[[BabylonFive Babylon 5]]'' also messed with the trope in a couple other ways. When the first actor to play Draal was unable to return due to illness, a new one was cast, the difference being remarked upon by Sheridan. Delenn replies that the Great Machine had restored to him his youth and appearance of thirty years prior. When the original actress to play [[spoiler:Anna Sheridan]] was unavailable, they recast her with [[spoiler:the real-life wife of the actor playing her onscreen husband]], and although the backstory involved would have made it ridiculously easy to hand-wave the change in appearance, they instead played it as TheOtherDarrin.
*** Fortunately, it was easy not to notice that it was a different actress.
*** Re-shooting the scenes from the earlier appearance (it was an old video Sheridan watched again) helped a lot there.
*** In addition, the aforementioned video of [[spoiler:Anna]] was the only 30 seconds we had been given of her before her return from [[spoiler:Z'ha'dum]], so it wasn't like we had a fresh image of her ingrained into our minds.
* The death of Philip Gilbert shortly into BigFinish's ''TheTomorrowPeople'' line was framed by having TIM require some repair work after damage received in Gilbert's last episode. John had to rebuild TIM's voice synthesizer, and couldn't quite reproduce the original voice. Gilbert's other recurring roles (He also voiced a family of clones on whose voice TIM had been modeled) were not so lucky, and became the InvisibleDarrin.
* In ''{{Lexx}}'', the change from Zev Bellringer to Xev Bellringer was explained via the former dying and melting into a puddle of goo, from which the latter was incarnated via the sacrifice of a few hapless astronauts. The reason given for her being so different in behavior and appearance after the resurrection is that the alien who brought her back was working from the imperfect memories of Zev's friends.
* In ''BigBadBeetleborgs'', Jo becomes the victim of a botched magical spell that alters her face from that of Shannon Chandler to that of Brittany Konarzewski. The change is permanent but a new spell makes everyone but the other heroes (and the viewer, of course) see her old face.
* Subverted in a HUGE way by the Australian lifestyle show parody ''LifeSupport''. In Season 3, Doctor Rudi changed actors, from Simon Van Der Stap to Jack Finsterer. However, it turned out that this new Dr Rudi, who had allegedly had MagicPlasticSurgery, was actually an impostor, and the old Dr Rudi was out for revenge. it culminated in [[spoiler:a fist-fight between the Rudis at the new Dr Rudi and Sigourney's wedding.]]
* On ''AlloAllo'', Herr Flick was played by Richard Gibson until series 9, when he was replaced by David Janson. To explain the change in actors (who looked NOTHING alike) Herr Flick had plastic surgery to radically alter his appearance so he would not be captured by Allied forces.
*Used for numerous minor characters on ''{{Stargate SG-1}}'', but this is an [[JustifiedTrope acceptable technique]] as the characters themselves are parasitic aliens (Goa'uld or Tok'ra) living in changable human hosts.
* Used in ''StargateAtlantis'' for [[spoiler: Elizabeth Weir. Previously played by Torri Higginson, Weir returned first as a faceless, fuzzy-voiced VirtualGhost, who then built herself a replicator body played by Michelle Morgan, who had in the previous season played F.R.A.N., a replicator [=McKay=] made. This allowed them to explain that to save time, Weir simply used the last template in the replicator machine, rather than try to remake her own appearance from scratch]].
**Interestingly, [[spoiler: Elizabeth Weir was also a TheOtherDarrin, played by Jessica Steen in the ''{{Stargate SG-1}}'' episode ''The Lost City'', before becoming a lead character on ''StargateAtlantis'', played by Torri Higginson]].
* German 90's TV show ''Balko'' used this. After the first actor Jochen Horst playing the main character left, the next season started with a near fatal car accident, forcing the till then unseen character to undergo plastic surgery, turning him into new actor Bruno Eyron (among the possible new faces given to choose from was also a famous German shepherd dog, 'Kommisar Rex').
* ''{{Supernatural}}'': Demons can possess different human bodies, so any demon character can be played by more than one actor. It happened with Lilith in Season 3, and then with [[spoiler: Ruby/Kristy]] between seasons 3 and 4.
** It also occurred with villains Azazel and Alastair, the possibility exists for this to happen with the angels as well. However, it's explicitly avoided with the character of Anna, whose human body was destroyed when she became an angel again, yet somehow replaced with an identical one.
*** It was {{Handwave}}d by Castiel who mentions that Anna appears to have gotten emotionally attached to her human body and called in a few favors to have it remade.
* The Terminator known as Cromartie is reduced to a metal skeleton in the first episode of ''TheSarahConnorChronicles'', and slowly creates a new flesh covering for himself over the course of the first season, being played by a second actor in the interim stages, and a third actor once the work is complete.
* Trance from ''{{Andromeda}}'' is interesting in that it was to change her ''makeup design'' instead of her actress. Part way through season two she's replaced with a future version of herself who looks completely different (even having a different ''skin colour''), but she's still the same actress behind the makeup.
** She still does act fairly differently however (presumably due to her being older and more mature than her previous self).
** Indeed, the change is so convincing, and done in such a way that is ''seems'' like a straight-up example of the trope, you really have to go over the credits to convince yourself it's the same actress!
* Shapeshifter [[{{Series/Heroes}} Candice]]'s favourite form was originally played by Missy Peregrym, but in her brief appearance in season 2 she had decided to change identities, and her new preferred form was Rachel Kimsey.
* Most SoapOpera actor changes are simply TheOtherDarrin (or {{SORAS}}es for the younger set), but occasionally they can be Nth Doctors. Example: Jerry Jacks of ''GeneralHospital'' had his MagicPlasticSurgery turn him from Julian Stone to Sebastian Roche...and it was good enough for him to successfully use an alias for a few months.
** One of the most infamous (and convoluted) versions of this occurred on ''DaysOfOurLives'': When Wayne Northrop - the actor portraying Roman Brady - left the show in 1984, his character was PutOnABus via [=shooting/=][[NeverFoundTheBody body snatching]]. Two years later, the younger, taller Drake Hogestyn took over the role. Playing this trope straight, they [[HandWave explained his physical differences]] by plastic surgery needed to recover from the injuries suffered at the hands of [[BigBadEvilGuy Stefano DiMera]]. Then Northrop returned four years after that... ''as Roman Brady''. He'd been held prisoner by DiMera, while DiMera sent brainwashed mercenary John Black (who, in an extra dash of Soap Operaness, turned out to be Stefano's half-brother) to take over Roman's life and be his spy ([[BecomingTheMask That didn't work so well for Stefano]]). But Northrop only stuck around three more years before leaving again. This time they went straight TheOtherDarrin and brought in Josh Taylor to play Roman (and has since 1997).
* {{Villain}} Al Hawke returns to BirdsOfPrey played by a different actor, his new face is explicitly the result of MagicPlasticSurgery to erase the scars of his burns from a previous episode.
* ''JoanOfArcadia'' and ''TheCollector'' were different actors play {{God}} & {{The Devil}}, respectively.

[[/folder]]

[[folder: Western Animation ]]

* Exception: {{Transformers}} often upgrade, and occasionally mutate, into newer, more powerful bodies. The degree to which their new looks resemble their previous style tends to vary, and sometimes they even change their name, as Hot Rod did on becoming Rodimus Prime in TheMovie, or like Overhaul did when he became Leobreaker in Cybertron. The voice actors tend to stay the same when this happens, as this is more about [[MerchandiseDriven selling toys]] than about recasting.
** [[LampshadeHanging Lampshaded]] in ''BeastWars''. Optimus Primal demonstrates all the toys and weapons in his new "Optimal" body, prompting Cheetor to remark that he learns his new bodies fast. Rattrap then remarks (staring directly at the camera) "Why not? He changes them often enough," accompanied by a RimShot.
**However, voice actor changes have occurred with upgrading. When G1 Megatron was upgraded into Galvatron in ''TransformersTheMovie'', Galvatron had the voice of ''Leonard Nimoy.'' Galvatron in the series proper was still voiced by FrankWelker, though. Also, Scourge and Cyclonus had new voice actors instead of those of Thundercracker and... either of the two characters Cyclonus could be. (Long story.) ''Beast Machines'' Jetstorm has a different voice than [[spoiler: Silverbolt]], because it'd ruin the surprise. And funny you should mention Leobreaker.
* By the time {{Toonami}} went off the air, it was being hosted by [=TOM4=]. Like the above Transformers example, more often than not there was no change in voice actors, with only the original having a different voice actor.

[[/folder]]

[[folder: Radio ]]

* To replace the late Peter Jones in the Tertiary Phase of ''TheHitchHikersGuideToTheGalaxy'', the guide receives an "update" during the first scene of the play. Thanks to some clever editing, the voice of the Guide changes in mid-sentence, and occasionally reverts back for a second, using recycled audio from the original series.
*In the 1940s ''{{Superman}}'' radio program, Supes' voice actor Bud Collyer was going on vacation and ThePowersThatBe needed a way to cover the lead actor's absence, so they came up with an idea: what if there were these strange {{green rocks}} that could [[KryptoniteFactor make Superman sick]]? This allowed the groans of the ailing hero to be portrayed by someone else. Kryptonite became a {{Canon Immigrant}} some years down the line.

[[/folder]]

[[folder: Web Original ]]

* Spoofed twice in the ''[[HomestarRunner Cheat Commandos]]'' cartoon "[[http://www.homestarrunner.com/ccdo6.html The Next Epi-Snowed]]". When Gunhaver's voice actor Crack Stuntman suddenly decides he wants to voice another character, Crackotage, instead, an in-story explanation is hastily concocted whereby a mishap of some sort caused Crackotage and Gunhaver's voices to become switched. Later, it is implied that Stuntman will be replaced when the Gunhaver character is said to have been sent on "a secret mission to the moon for an undisclosed period of time, and that when he gets back his voice might have changed."

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