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[[quoteright:225:[[Creator/ChristianBale http://static.tvtropes.org/pmwiki/pub/images/baleweightchange_6558.jpg]]]]
[-[[caption-width-right:225:Top: Creator/ChristianBale in ''Film/TheMachinist''. Bottom: Bale in ''Film/BatmanBegins''... roughly six months later.]]-]

Every job has its demands, and many people make sacrifices in their personal lives to advance their careers. However, actors and actresses sometimes experience some peculiar demands on their physical appearance, well beyond the common restrictions in other professions that may simply require neatly-trimmed hair of a natural color.

There are limitations to what can be done with stage makeup and padding. When performers make real changes to their physical appearance for a part, such that they look different in the mirror in the morning, that's commitment. That's Dyeing for Your Art.

This entry does not cover those actors and actresses who dye their hair all the time for professional or personal reasons e.g. BilliePiper, [[Music/NoDoubt Gwen Stefani]] and the late MarilynMonroe. They're DyeHard. Though the two can overlap sometimes if an actor prefers the hair color they were required to change to and keeps it that way.

Often overlaps with OscarBait nowadays. When the casting directors opt to have the actors focus on their performance instead of the character's appearance it's AbilityOverAppearance.

----
!!Examples:

[[foldercontrol]]

[[folder:Film]]
!!!Hair change:
* Creator/AnnaFaris is blonde, but dyed her hair black for the first two movies in the ''ScaryMovie'' franchise as a parody of Neve Campbell in the ''Franchise/{{Scream}}'' films. She gave up on it by the third, which is helped considering the main "inspiration" for that one, ''Film/TheRing'', also stars a blonde. She claims on [[ComedyCentral Canned Ham: Scary Movie]] that she told the casting people she was a natural brunette. No doubt she knew what happens to blondes in horror movies.
* ''Franchise/{{Scream}}'': Rose [=McGowan=] went blonde to play Tatum, to contrast with brunette Neve Campbell. Emma Roberts did the inverse for the fourth film, darkening her hair to play Jill, an {{Expy}} for Campbell's Sidney.
* Bob Geldof actually shaved his own eyebrows off when playing Pink in the movie ''Music/TheWall''. However, he drew the line at shaving ALL of his hair off, so it looks like it's been simply slicked-back after his transformation.
* Creator/CharlizeTheron dyed her hair black in order to play the title character in ''Film/AeonFlux''
* Gene Hackman was tricked into shaving his mustache to play LexLuthor in ''Film/{{Superman}}''. Director Richard Donner had had a mustache shortly before he went to see Hackman about the part. Hackman didn't know he had shaved it off already, so Donner wore a false mustache that the makeup department made up for him. When he saw Gene, he told him that if he shaved off his mustache then he would shave off his own. So, Gene Hackman shaved off his moustache right in front of Donner and then said "Your turn" whereupon Donner pulled off his fake. Hackman was most displeased but, fortunately for Richard Donner, is quite undisposed to violence. On the other hand, Hackman flat out refused to shave his head to play the [[BaldOfEvil famously bald]] Luthor. Instead, he came up with the RunningGag of Luthor wearing a different wig in every scene (and wearing a bald wig when he's arrested).
* Gretchen Mol, a blonde, played the title role in ''TheNotoriousBettiePage''. Page was a brunette. Whether Mol dyed her hair or wore a wig on her head is not known, but in a couple of brief nude scenes, the hair in her lower regions was definitely brunette. You may draw your own conclusions.
* JoshHartnett shaved his head for ''Film/BlackHawkDown''. Because of this, he wore a wig for ''Literature/TheVirginSuicides'', which he then gave to JeffreyEugenides as a souvenir.
* Creator/IngridBergman cut her hair quite short for her role in ''For Whom the Bell Tolls'', annoying Max Steiner, who wanted her to come back and re-shoot some ''Film/{{Casablanca}}'' scenes with an original song in place of "As Time Goes By".
* Javier Bardem's roles in ''Film/{{Skyfall}}'' and ''NoCountryForOldMen'' both involve a bad haircut. ''Film/{{Skyfall}}'' is the only one that he had to [[http://images.wikia.com/jamesbond/images/b/ba/Skyfall_Silva_Poster.jpg dye his hair]] for, although Bardem famously worried that he wouldn't get laid for three months while shooting ''NoCountryForOldMen''.
* Creator/JenniferConnelly [[http://justjared.buzznet.com/2009/11/13/jennifer-connelly-goes-blonde/ dyed her usually raven hair blonde]] for the film ''Whats Wrong With Virginia''.
* Jerome "Curly" Howard of Film/TheThreeStooges shaved his head and his thick moustache specifically for his Stooge character when he joined the act.
* JohnnyDepp, in TheMovie of ''Film/FearAndLoathingInLasVegas'' cut his hair to resemble his character's male pattern baldness. For added authenticity, Hunter S. Thompson personally shaved Depp's head. With a [[Film/SweeneyToddTheDemonBarberOfFleetStreet straight razor]]. [[CloudCuckooLander While wearing a miner's headlamp.]]
* KalPenn had his head shaved on camera for ''Film/TheNamesake''.
* LindsayLohan dyed her hair brown for ''Georgia Rule'', then changed it to black for ''Film/IKnowWhoKilledMe'' then she went blonde for ''Film/{{Machete}}''.
* Creator/MattSmith lost his signature floppy locks for his part in ''Lost River''. Debate still rages over how well it suits him.
* Creator/MonicaBellucci, for the Italian movie ''{{Malena}}'', dyed her own hair first red (and cut it at shoulder length), then blonde, then sacrificed it completely for the scene where she is [[TraumaticHaircut shorn]] by force by the other women of the city. She went blonde again for the film ''Le Deuxieme Souffle''.
* NaomiWatts, while she's naturally blonde, dyed her hair brunette for ''ThePaintedVeil''. And that's the least of it.
* Creator/MelGibson waxed part of his leg on camera for a shot in ''WhatWomenWant''.
* Moe Howard of the Film/TheThreeStooges began dying his hair black once it started going noticably gray. He also allegedly dyed it reddish-brown for a period of time in his younger days.
* KristenStewart dyed her hair black and cut it into JoanJett's style to play her in the ''Runaways'' biopic.
* For KristenStewart's role as a runaway teenage stripper in ''WelcomeToTheRileys'', she learned how to pole dance, deprived herself of sleep, chain-smoked, and ate mostly junk food. As a result her body and legs were covered with bruises, her skin was blemished, and she constantly looked tired.
* Pauly Shore had his "trademark" dreadlocks shaved on-camera for ''Film/InTheArmyNow''.
* Persis Khambatta shaved her hair for her role in ''Film/StarTrekTheMotionPicture''.
* Pete O'Hern grew a beard for the Creator/PeterJackson film ''Film/BadTaste''. Unfortunately for him, the film's low budget caused it to be filmed over four years, requiring him to keep the beard the whole time.
* Rhiana Griffith shaved her head to play Jack in ''Film/PitchBlack''
* Sofia Vassilieva (of ''Series/{{Medium}}'') shaved off her eyebrows and long blonde hair for her role as a cancer patient in ''Literature/MySistersKeeper''. Her co-star, Creator/CameronDiaz, wore a bald cap for the brief scene where she shaved her head. Vassilieva reportedly got the role after Creator/DakotaFanning stepped down, refusing to shave her head for the film.
* Creator/SteveCarell's body-waxing scene in ''Film/TheFortyYearOldVirgin'' was [[PainfulBodyWaxing authentic]]. The results of the waxing are relevant to later scenes in the movie, so Carell had to have kept his chest hair in that condition for a while.
* Creator/SteveMartin has been iconically silver-haired since the 1970s, but has dyed it darker for very few films including ''Film/LittleShopOfHorrors'' and ''Film/DeadMenDontWearPlaid.''
* Telly Savalas shaved his head to play Pontius Pilate in ''Film/TheGreatestStoryEverTold'' -- and it became a trademark for the rest of his career.
* Tom Felton, for his role in the ''Film/HarryPotter'' movies as the blond Draco Malfoy, bleached his hair ''for ten whole years''. James & Oliver Phelps dye their hair red to be the Weasley twins, as did Mark Williams to play Mr. Weasley.
** The filmmakers initially had DanielRadcliffe wear green contacts to match the book's description of Harry's eyes. Unfortunately, his eyes couldn't tolerate them and it was decided that making them green during post-production was too much of a hassle, so they dropped the idea.
* TomCruise did it at least twice. He dyed his hair blond for ''InterviewWithAVampire'' because AnneRice (who wrote the novel) insisted that Lestat should be played by a blond actor. He also dyed his hair for the film ''{{Collateral}}''.
* Creator/RobinWilliams:
** He has bleached his hair blond three times: ''Film/{{Popeye}}'' (1980), ''Film/{{Toys}}'' (1992), and ''OneHourPhoto'' (2002). He also dyed it red for ''AugustRush''.
** He had his infamously hairy body waxed/shaved for ''Literature/TheWorldAccordingToGarp'', ''Film/{{Hook}}'', and ''WorldsGreatestDad'', to make him look younger in the first two cases, and in the third so as to not be distracting during his skinny dipping scene.
* Yul Brynner shaved his head for ''Theatre/TheKingAndI'', and (like Telly Savalas) didn't grow it back. He also bulked up during ''Film/TheTenCommandments'' because he didn't want to appear scrawny next to Charlton Heston....which is why he's so fit in ''The King and I''.
* ZacharyQuinto shaved off most of his normally formidable eyebrows to play the role of Spock in ''Film/StarTrek''. Also, his Spock bowl-cut was real.
* ''GIJoeTheRiseOfCobra'':
** Sienna Miller, blond, dyed brunette to play TheBaroness.
** Rachel Nichols, blond, became the redheaded [[MeaningfulName Scarlett]].
* ''Franchise/StarWars'' Prequels:
** Ray Park shaved his head to play Darth Maul in ''ThePhantomMenace''.
** Ewan [=MacGregor=] actually grew his hair long so that the braid he wore as a Padawan would be his own hair, while the rest of the growth was shorn close, to play Obi-Wan. He also grew a beard for episodes 2 and 3.
* Having your hair cut off is one thing but Vanessa Hudgens took this a step further by chopping of her own hair herself for the film ''Gimme Shelter''.
* Taylor Kitsch cut off his shoulder length hair in order to play a US Naval officer in the film ''Film/{{Battleship}}.''
* Creator/JosephGordonLevitt gave himself a buzz cut onscreen to play a cancer patient in ''[[FiftyFifty 50/50]]''.
* There was a huge fan uproar when blonde Jennifer Lawrence and dark-haired Josh Hutcherson were cast to play the dark-haired Katniss and blonde Peeta in ''Literature/TheHungerGames''. Director Gary Ross assured the fans that everyone would have the proper hair colors. Lawrence joked about it saying "I wasn't aware that everybody was so upset until after I got my hair dyed, and people were like, 'Oh my gosh, blond hair can turn brown. Wow. It's a miracle!' "
* Works for horses, too. For ''Film/TheBlackStallion,'' the production team needed a solid black Arabian stallion. Instead, they found Cass Ole, who had a star and socks. Therefore, out came the dye.
* ''Film/TheWizardOfOz'': the "green" horses in the Emerald City got their verdant hues from something like Jell-O powder. Problems occurred when the horses took to [[ITasteDelicious licking the sweet powder off their fur]].
* MollyRingwald dyed her red hair black for the film adaptation of ''TheStand''.
* One of the director/producers of ''Film/{{Airplane}}'' tells the story of being pretty much a punk kid at the time the movie was made, and hesitantly approaching Robert Stack and asking if just possibly the actor would be willing to dye his hair for the movie. Stack laughed and made a comment to the effect of "Don't worry about it, kid, when you bought me, you bought the package."
* When Sadie Frost was cast as Lucy in ''Bram Stoker's Dracula'' she dyed her brown hair red because producers felt she resembled co-star Winona Ryder too much.
* Alex Pettyfer shaved his head bald for ''Literature/{{Beastly}}''. Reportedly his hair had been a security blanket for him so the traumatic experience of getting it cut [[EnforcedMethodActing helped him understand]] [[BeautyToBeast his character's situation]].
* EmilyBrowning went platinum blonde to play Babydoll in ''Film/SuckerPunch''. The process ended up frying her hair and she had to cut it short the moment filming wrapped.
* It took 36 hours for Nikki Reed (a natural brunette) to bleach her hair blonde to play Rosalie in {{Twilight}}. As a result she wore wigs for the remaining films. Ashley Greene wore a wigs for the first two films to play Alice but cut her hair short (firstly in ''New Moon'' to help it fit under the wig better) for the remaining films.
* Franka Potente dyed her hair red for ''RunLolaRun''. As the colour was so sensitive (and the entire film takes place over the course of twenty minutes) she couldn't wash her hair during production.
* James [=McAvoy=] bleached his hair to play punk Rory O'Shea in the Irish film ''Film/InsideImDancing''.
* Simon Woods who played Mr Bingley in 2005 version of ''Film/PrideAndPrejudice'' was asked to dye his hair ginger in order to match with his on-screen sister Miss Bingley (Kelly Reilly). The director said in the [=DVD=] commentary that Simon was slightly angry as the colour stuck and his hair continued to grow as such.
* Creator/KarenGillan shaved her head for ''Film/GuardiansOfTheGalaxy''.
* ''Film/TheEast'': the blonde Brit Marling plays a brunette who changes her appearance by dyeing her hair blonde. She remains Marling's natural hair color of the rest of the film.
* Nicholas Hammond underwent several painful hair bleachings (he is naturally brunet) to play Friederich in ''Film/TheSoundOfMusic''.
* Megan Fox dyed her normally black hair red to play April O'Neal in Michael Bay's ''Teenage Mutant Ninja Turtles'' movie.
* An accidental example for ''The Walk In The Clouds''. Debra Messing's hair was meant to be dyed blonde but it was accidentally dyed red. Afterwards Messing noticed she was getting [[HeroesWantRedheads more parts with red hair]] so she kept it.

!!!Weight change:
* Andy Serkis, when he was cast to play Ian Dury in the biopic ''Sex and Drugs and Rock and Roll'', spent time at the gym strengthening one side of his body so he could realistically emulate Dury, who had a crippled arm and leg as a result of suffering polio in his childhood.
* Creator/AishwaryaRai had to gain weight for her role in ''Guru''. She then lost 22 pounds ''in three days'' for her role in ''{{Dhoom}} 2''.
* BenedictCumberbatch has bulked up at least two suit sizes for ''Film/StarTrekIntoDarkness''.
* Benicio del Toro, for TheMovie of ''FearAndLoathingInLasVegas,'' gained enough weight to become practically unrecognizable.
* Bradley Cooper put on about 25 pounds so he could look like he could convincingly tackle and injure Vince Vaughn in ''Film/WeddingCrashers''.
* Creator/ChrisEvans [[http://www.comicbookmovie.com/images/uploads/capset4.jpg seriously bulked up]] and shaved to play ComicBook/CaptainAmerica in ''[[Film/CaptainAmericaTheFirstAvenger The First Avenger]]'' and ''Film/TheAvengers'' (and also dyed his hair golden-blond). Averted in [[http://www.cnn.com/2012/05/07/showbiz/movies/secret-avengers-after-credit-scene-ew/index.html the post-test-screen pickups]] for ''Film/TheAvengers'' after Evans had regrown his facial hair. Rather than have to shave all over again for just a couple of scenes, Cap's face was concealed by a prosthetic or by his hand - and he also wore a wig, as he now had a buzz-cut (most notably in the end-of-credits stinger [[spoiler:in the shawarma restaurant]]).
* [[Film/{{Thor}} Chris Hemsworth]], to play [[TheMightyThor Thor]], well... ''[[http://cache.gawkerassets.com/assets/images/8/2010/07/man-08046r.jpg DAMN.]]''
** To the point where he actually had to lose weight mere days before shooting because the Thor tights were cutting off circulation.
* Creator/ChristianBale already had to buff up a lot for his role in ''AmericanPsycho''. A few years later he lost 63 pounds to appear in ''Film/TheMachinist'' (2004), making him unhealthily underweight. (He actually shot for the exact weight of the character in the script, even as the director and the producers told him he was skinny enough. He was eating an apple and a can of tuna per day.) He then gained 40 pounds above his ''normal'' weight to play Franchise/{{Batman}} in ''Film/BatmanBegins'' (2005), Then he lost 20 pounds of that. Later, he again became underweight to play an inmate in a UsefulNotes/VietnamWar prisoner camp in ''Rescue Dawn''. Then he bulked up again to play Batman for the second time in ''Film/TheDarkKnight''. Then he went skeletal again to play a crack addict in ''TheFighter'' (2010). Then he played Batman again in ''Film/TheDarkKnightRises'' (2012). Then, he put on 43 pounds to play an overweight man in ''Film/AmericanHustle'' (2013). Let's just say Bale's refined Dyeing For Your Art to an art form itself.
* HaydenChristensen ate six meals a day and spent hours in the gym in preparation for Anakin Skywalker's more muscular look in ''Film/RevengeOfTheSith.''
* Creator/DanielCraig buffed up, gaining 20 lbs of muscle to play Film/JamesBond in ''Film/CasinoRoyale''. However, he did refuse to actually Dye For His Art for Bond. He wouldn't dye his blonde hair to fit better with earlier screen Bond's darker hair colors.
* Donnie Wahlberg shed at least 25 pounds for his role as Vincent in ''Film/TheSixthSense'', a character that was only on-screen for a couple of minutes early in the film.
* ForrestWhittaker gained about 50 pounds for his role as Idin Amin in ''TheLastKingOfScotland''.
* Music/FiftyCent, known for his large physique, lost 55 lbs in 9 weeks by going on an all liquid diet and working out 3 hours a day in order to play a cancer stricken football star in ''Things Fall Apart''.
* Jared Leto resorted to fairly {{squick}}y methods (like drinking melted Haagen Dazs ice cream laced with olive oil and soy sauce) to gain the extra 62 pounds he needed to play John Lennon's killer Mark David Chapman in the film ''Chapter 27''.
* Jennifer Hudson gained 30 pounds to play Effie White in ''{{Theatre/Dreamgirls}}''. While Beyonce Knowles lost 20 pounds to play Deena in the same film.
* Jennifer Jason Leigh got down to 86 pounds to play a girl suffering from an eating disorder in the 1981 telefilm ''The Best Little Girl in the World''.
* Karl Urban, while already a bulky actor, gained some more muscle to fit better under Comicbook/JudgeDredd's armor in ''Film/{{Dredd}}''.
* According to WordOfGod , Laura Linney ate donuts and gained 20 pounds for her role in ''Film/{{Kinsey}}''. It's barely noticeable.
* Creator/MikaelPersbrandt, a swedish actor, has lost more than 30 pounds and buffed up noticeably for his role as the title character in ''Film/HamiltonInTheInterestOfTheNation''.
* Rain (Korean pop star) spent 8 hours a day in intense physical training, while eating nothing but salad and chicken, to play the lead in ''Film/NinjaAssassin''.
* Creator/RalphFiennes packed on about thirty pounds to play the portly labour camp commandant in ''SchindlersList''.
* ReneeZellweger put on weight to play Literature/BridgetJones, then lost it ''all'' and then some to play Roxie Hart in ''Film/{{Chicago}}'' before putting it all back on again for ''Literature/BridgetJones 2''.
* Creator/RichardEGrant actually gained weight to match the script's description of Withnail in ''Film/WithnailAndI'' only to be told by the director that he had to lose a stone if he wanted the role.
* SylvesterStallone put on 40 pounds for his role in the movie ''CopLand'' by eating pancakes at a local diner three times a day. By the time he was called back for reshoots he already lost the weight. He's also taken to using growth hormones to maintain his impossibly muscular physique for various roles.
* TaylorLautner (Jacob from ''Literature/{{Twilight}}''), to avoid being [[TheOtherDarrin re-cast]] in the sequel, worked out religiously and gained 30 pounds of muscle. [[ShirtlessScene Much shirtlessness ensued]].
* TaylorKitsch lost thirty pounds of muscle -- and took up smoking! -- to play suicidally-depressed photojournalist Kevin Carter in ''The Bang-Bang Club''. Kidney problems resulted.
* Thomas Jane trained with the Navy [=SEALs=] for about half a year and gained more than twenty pounds of muscle for his role in ''Film/ThePunisher2004''.
* ValKilmer needed to look sickly for his role as Doc Holliday in ''Film/{{Tombstone}}'', so he spent weeks leading up to the shoot eating almost nothing but onions and tomatoes.
** Ditto for Dennis Quaid for the same role in the competing Creator/KevinCostner vehicle ''Film/WyattEarp''. Quaid lost so much weight that he lacked the energy to stand and had to take frequent rests between takes.
* TildaSwinton gained a significant amount of weight for her role in ''Film/MichaelClayton''. She didn't seem to mind, though, as it meant she could basically eat everything she wanted until she met her target look.
* Vincent D'Onofrio gained ''70 pounds'' of fat to play Private Pyle in ''Film/FullMetalJacket''. The added weight later caused the ligaments in his knees to tear up during the obstacle course scene.
** His next movie, which came out later in 1987, was ''Film/AdventuresInBabysitting''. He looked like [[http://thelittlegoat.com/?p=1764 this]].
* ''Film/ThreeHundred'': the actors look like they're capable of incredible feats of strength and endurance. They were trained by a mountaineer named Mark Twight not just to look like that, but to ''be'' like that. They weren't just playing humans [[CharlesAtlasSuperpower honed to Batman-like levels of physical might]]; they actually ''were'' humans honed to Batman-like levels of physical might.
* TomHardy (five-foot-ten, 180 lbs) put on forty pounds of muscle to play [[AxeCrazy British prisoner]] [[NamesTheSame Charles Bronson]] in ''{{Bronson}}''. He got even bigger to play Bane.
* Mickey Rourke bulked up considerably for his role in ''TheWrestler''.
* Creator/JosephGordonLevitt bulked up and trained with stuntmen for his role in ''Film/{{Inception}}'' so he could perform the stunts himself.
* Creator/RobertDowneyJr gained 20 pounds of muscle to play [[Film/IronMan Tony Stark]] by adding weight training and significant diet changes to his usual Wing Chun training. Then he slimmed way down to play Film/SherlockHolmes, bulked ''back'' up to play Tony Stark again, slimmed ''back'' down to play Film/SherlockHolmes again, and bulked ''back'' up to play Tony Stark again.
* The already quite fit RyanReynolds and JessicaBiel both went through extremely intense training for their action-intensive roles in ''BladeTrinity'' -- working out 4 hours a day, 7 days a week, for several months.
** Biel went on to lose a lot of that muscle mass, then gained a ton back for ''Film/TotalRecall2012''.
* ''Film/PainAndGain'':
** Wahlberg is no stranger to exercise or being in good shape regardless, but he really packed on muscle to convincingly portray a bodybuilder.
** [[http://imgur.com/gallery/zpUQ0 As did Dwayne Johnson]], who could have played the role without doing so.

!!!Both/Other:
* Creator/AnneHathaway lost a significant amount of weight to play Fantine in ''Film/LesMiserables2012''. She also did Fantine's TraumaticHaircut for real, on camera. . She refuses to say precisely what she did to lose weight, because she knows it wasn't safe and she didn't want to risk fans emulating her methods.
** HughJackman also lost weight, grew a beard, and went 36 hours without water for the opening scenes, after Valjean left prison. He then gained weight for the later scenes... and after filming wrapped had to bulk up to [[Film/TheWolverine a return to his trademark role]].
* Charles Grodin has permanent scars on his wrists due to the handcuffs he wore in ''MidnightRun''.
* Creator/CharlizeTheron put on about thirty pounds, partially shaved and bleached her eyebrows, and had her actual hair thinned and damaged to play serial killer Aileen Wuornos in ''Monster''.
* Choi Min-Sik, as the protagonist Oh Dae-Su in ''OldBoy'', gained and lost considerable amounts of weight (repeatedly) to simulate a man being held in captivity for 15 years. Oh Dae-Su also kept track of how many years he had been confined by literally tattooing tally marks onto his arm. Unable to pull off the special effects required to depict this, Choi actually applied some of the tattoos for real on camera...using a piece of hot wire.
* Creator/EdwardNorton gained a lot of muscle for ''Film/AmericanHistoryX'', and lost most of it afterwards to play the insomniac, beaten down protagonist of ''Film/FightClub''. Also for ''American History X'', he as well as Creator/EdwardFurlong shaved their heads to play convincing skinheads.
* Ellen Page had her head shaved on camera for the film ''Mouth to Mouth'', which led to her being mistaken for a boy when auditioning for ''HardCandy''. She nearly starved herself to look like (and feel the pain of) torture victim Sylvia Likens while filming ''An American Crime''. A special feature on the ''{{Juno}}'' DVD shows her audition, and her face is so gaunt it's no wonder she had to gain back the weight in order to play a pregnant girl!
* Creator/DemiMoore buzzed her hair down to the scalp on camera for ''GIJane'', and worked out religiously to simulate the effects of going through combat training. She had ''long'' black hair at the time.
* GaryOldman lost so much weight to play Sid Vicious in ''SidAndNancy'' that he was actually hospitalized at one point. He also shaved his head for at least three of his other films: ''{{Meantime}}'', ''ImmortalBeloved'', and ''Film/TheFifthElement''.
* Georgina Cates dyed her hair and pretended to be a natural redhead to win the lead in the film ''An Awfully Big Adventure''. She also changed her name, invented a completely fake past from Liverpool (the same city as the character was from) and [[DawsonCasting pretended to be a teenager when she was actually 21]] so that the casting directors would see her for the role again - the first time she auditioned she was told she wasn't suitable.
* Creator/HalleBerry didn't bathe and wore the same clothes for several days to convincingly play a crack addict in ''Jungle Fever''.
* HilarySwank went into hard training, and put on twenty pounds of muscle, for her role as boxer Maggie Fitzgerald in ''MillionDollarBaby''. She also cut her hair, lost weight, started binding ([[SuppressedMammaries ie, flattening breasts]]) and generally acting like a boy for her role in ''Boys Don't Cry'', to the point where her neighbours didn't recognise her and assumed that her brother must have been staying.
* Jamie Foxx wore prosthetics over his eyes which made him blind for as many as 14 hours a day, and also learned Braille, in order to convincingly play RayCharles in ''Film/{{Ray}}''.
* Creator/JimCarrey:
** He put on a lot of weight for his upcoming role as Curly in the upcoming ''Film/TheThreeStooges'' movie. But then dropped out of the film because he was worried about his health.
** He shaved his head for ''ASeriesOfUnfortunateEvents''.
** He also shaved his head and lost weight for scenes in the Creator/AndyKaufman biopic ''Film/ManOnTheMoon'' in which Kaufman was dying of cancer.
** He also starved himself for two weeks to play Steven Jay Russell, a con artist [[spoiler: purportedly]] dying of AIDS. [[spoiler: The real Stephen Jay Russel didn't have AIDS either, he merely starved himself and falsified his medical records as part of an elaborate escape plan.]] Carry also shaved off his widow's peak to expose more of his [[ForeheadOfDoom forehead]] and [[MyBrainIsBig look smarter]]
* KeanuReeves:
** He shaved his head (including his eyebrows) as well as his body for the "real world" scenes in ''Film/TheMatrix''. Those scenes were the last ones filmed, and were shot all together. The very last scene shot was the one where he first woke up in the real world, and he had lost considerable weight to give a slightly emaciated appearance.
** The producers of ''Film/{{Speed}}'' demanded he have a more respectable haircut (he had long hair), but balked when he showed up with a buzzcut, trying to insist he wear a wig for the film. The Director vetoed.
** Gained 23 pounds to play a quarterback in ''Film/TheReplacements''.
** He also gained weight for ''Film/TheLast TimeICommittedSuicide''.
* Creator/MattDamon:
** He [[http://www.radio538.nl/web/show/id=46246/contentid=82691 grew as an actor]] in order to play the lead in Steven Soderbergh's ''TheInformant!''
** He lost a dangerous amount of weight to play a drug addicted soldier in ''Courage Under Fire''. This frail look almost made him lose the part of [[SavingPrivateRyan James Ryan]].
* Max Schreck shaved his head for ''Film/{{Nosferatu}}'' and put some sort of hideous wiring around his eyes to make them bug out. Really.
* NataliePortman's head was shaved, on camera, for ''Film/VForVendetta''.
** She lost twenty pounds along with co-star MilaKunis to play a ballet dancer in ''Film/BlackSwan'', and took a year of ballet lessons before shooting began.
* NickNolte grew out his hair and facial hair to achieve a crazed loner look for ''Film/{{Hulk}}''. It was in this unfortunate state that his infamous mug shot was taken. He also gained 50 pounds to play a paunchy detective in ''Q & A''.
* Creator/PeterSellers' hair began to seriously gray in the late 1960s, so in many of his films from roughly 1969 onward, his hair is a dye job of some sort. A key exception is ''BeingThere'', where he had his wife cut his gray hair short (figuring Louise, Chance's maid, would have been cutting it for him all these years). He also gained a good deal of weight, despite pre-existing heart problems, to reflect Chance's sedentary nature. Sellers was sensitive about his appearance and actually ''hated'' how he looked for the film, but felt it was what Chance should look like. (Some think losing the weight afterward contributed to his early death.)
* Creator/ParkerPosey had a dentist attach "train track" braces to her teeth to play a yuppie caricature in ''Film/BestInShow''. Michael Hitchcock as her character's husband settled for fake ones.
* RitaHayworth, was directed by husband Creator/OrsonWelles to cut and dye her famous long red hair for ''TheLadyFromShanghai''.
** And more hilariously, Welles himself lost weight to play Falstaff in ''[[Theatre/HenryIV Chimes at Midnight]]''. That's right. Orson Welles was SO OVERWEIGHT that he had to slim down to '''[[FatBastard play]] [[LargeHam freakin']] [[BoisterousBruiser Falstaff]]!!!'''
** What's more, Rita was already a Dyeing For Your Art DyeHard, because she was a natural brunette who had to dye her hair red as part of a career RaceLift to cover up the fact she was Hispanic.
* RobertDeNiro:
** He famously gained 60 pounds to play Jake [=LaMotta=] in ''RagingBull''; he was one of the first actors to undergo such a transformation for an onscreen role. He gained the muscle training with the real Jake [=LaMotta=] until [=LaMotta=] decided he was ready to go pro - [=LaMotta=] later said that he thought [=DeNiro=] could have been in the Top 20 middleweights of all time.
** He packed on thirty pounds and had his hairline shaved back and receded to play Al Capone in ''Film/TheUntouchables''.
** He also put on a little bit of weight for the scenes in ''[[Film/TheGodfather The Godfather Part II]]'' where his character returns to Sicily.
** For ''CapeFear,'' he paid a dentist $20,000 to seriously screw up his teeth to play long-term prison inmate Max Cady. It cost him $25,000 to have the damage fixed after the movie was over. He was also tattooed with vegetable dyes, which fade after a few months, and worked out to the point of having almost no body fat.
** ''TaxiDriver'' is a subversion, as he didn't really get his head shaved in a mohawk (they still had scenes to shoot with his hair, so a bald cap with a horse mane was put on De Niro's head). However, he did shed thirty-five pounds to play the role of Travis.
* RussellCrowe gained weight and shaved his head to make room for a wig for ''The Insider'', and gained lots of muscle for ''Film/{{Gladiator}}''.
** British film critic MarkKermode points out that Crowe does this for a lot of roles and claims you can identify Crowe's 'serious' films based on his paunch.
* Creator/SigourneyWeaver shaved her head for ''Film/{{Alien 3}}'', and dyed her hair red for ''Film/{{Avatar}}''.
* Creator/TomHanks grew a rather lengthy, unkempt beard and lost 30 pounds for ''CastAway''. He gained the weight he was expected to lose during filming in advance, and the movie was put on hold while he lost it. He also slimmed down drastically to play an AIDS patient in ''Philadelphia.''
* Creator/TomHiddleston dyed his naturally blond hair black (and straightened it) to play Loki in ''Film/{{Thor}}'', lightened it to a reddish-blond for ''Film/MidnightInParis'', and darkened it again for ''The Deep Blue Sea''. His poor, poor hair.
** For ''Film/{{Thor}}'', Hiddleston had originally auditioned for the title role, gaining 20 pounds of muscle in the process. Director KennethBranagh then told him he'd be more suited for Loki, and asked him to lose the weight in order to play a slim, pale younger brother.
* ''Film/IronMan'':
** Creator/RobertDowneyJr did some pretty hefty physical training to bulk up for playing Tony Stark in the first one. In an interview, he said his logic was something along the lines of "I'm not going to be able to do this for too much longer, so I might as well while I can".
** Creator/ScarlettJohansson dyed her hair red as Comicbook/BlackWidow (which also saw the return of another blonde dying her hair, Creator/GwynethPaltrow) for the sequel. In ''Film/TheAvengers'' she not only kept the red but also cut her hair short, but will be wearing a wig in ''Film/CaptainAmericaTheWinterSoldier''.
* ''Film/TheLordOfTheRings'':
** Orlando Bloom had a Mohawk during filming in order to accommodate the widow's peak hairline on his Legolas wig.
*** Also he, along with the rest of the cast of ''BlackHawkDown'' had his head shaved by military barbers and participated in boot camp to prepare.
** Brad Dourif had his eyebrows repeatedly shaved to play Grí­ma Wormtongue.
** Sean Astin put on weight for Sam, too.
* ''Film/{{Spider-Man}}'':
** KirstenDunst used a combination of her real hair (dyed) and a partial wig for the first movie, with the join between the real and fake hair being [[http://www.comicbookmovie.com/images/uploads/MJvsDunst.jpg painfully obvious at times]]. She used her own hair (again dyed) for the second and third one.
** Creator/TobeyMaguire had to gain some muscle to play Spider-Man. His worst experience was for the second movie, because he had become very thin to play a jockey in ''Film/{{Seabiscuit}}''.
** Bryce Dallas Howard (Gwen Stacy) was the opposite of Dunst: redhead becoming blonde.
** ''Spider-Man 3'' scored the hat-trick of hairdyes when you factor in Creator/ElizabethBanks as Betty Brant (blonde to brunette).
** Topher Grace gained 24 pounds of muscle and bleached his hair to play Eddie Brock in ''Spider-Man 3''.
** Thomas Hayden Church put on 28 pounds of muscle and dropped 10 pounds of fat for Sandman.
*** In articles at the time, it was stated that they wanted him to gain more muscle weight but gave up on it due to Church pretty much hitting a plateau.
** EmmaStone is known as a redhead, but reverted back to her natural blonde to play Gwen Stacy in ''Film/TheAmazingSpiderMan'' - before her casting was officially announced, it was rumoured she'd be playing the red-headed Mary Jane Watson.
*** Before that Emma Stone's hair became red in the first place when she was asked to dye it for ''Superbad''.
* ''Film/SuperTroopers'': all the members of Broken Lizard grew mustaches and built up their forearms to give themselves a more stereotypical highway patrolman look. One scene features Kevin Heffernan using one of the workout tools they used.
* ''{{Hairspray}}'':
** ZacEfron dyed his hair (dark) brown and put on 15 pounds.
** Amanda Bynes took two hours to get her pigtails right, and risked losing her teeth from eating ''around 40 lollipops a day''. Yeesh!
* For the ''Film/XMen'' movies, Creator/HughJackman, Creator/LievSchreiber, and Creator/RyanReynolds worked out to get ripped bodies, and FamkeJanssen dyed her hair red.
** Kelsey Grammer's makeup as Beast, and Vinnie Jones in a muscle suit for Juggernaut in ''Film/XMenTheLastStand''. Cameron Bright also had to shave his hair daily, and pass makeup on the scalp (as Leech had to look more like a chemotherapy survivor than a shaven kid).
** For ''Film/TheWolverine'', HughJackman regained a ton of muscle after losing weight for ''[[Film/LesMiserables2012 Les Miserables]]''.
** Jackman has declared this when he was warned about [[Film/XMenDaysOfFuturePast another X-Men]] during the shoot of ''Film/TheWolverine'':
-->"I must admit I was starting to see a life free of steamed chicken breasts. They told me the idea and, at the time, it was Matthew Vaughn [directing]. Instantly, I knew it was a winner. It just felt like everything was coming full circle. However, I must admit my stomach and my mind were like, ‘Oh no.'"
* To play Lisbeth Salander in Creator/DavidFincher's remake of ''[[TheMillenniumTrilogy The Girl With The Dragon Tattoo]]'', Rooney Mara chopped her long brown hair off and went to a dyed-black pixie cut, bleached her eyebrows, got both ears pierced four times, and got her eyebrow and one nipple pierced as well (lip and nose piercings were fake). Say what you will about her, she doesn't do things in half measures.
** Creator/NoomiRapace (the actress who played Salander in the original Swedish films) deserves mention also. In addition to performing image alteration similar to Mara's [[note]] she trained relentlessly to become thin and wiry, dyed and chopped her hair, got pierced (nostril, septum, eyebrow and multiple ear piercings) etc.[[/note]], Rapace took up smoking for real during filming [[note]] smoking convincingly is actually quite difficult for non-smokers to emulate, and she wanted to get it perfect[[/note]] and took to dressing and acting "in-character" even when not on camera...to the point where family and friends began to worry as to her sanity. There's a very good reason she refused to do the role again for the American remake.
* Averted in ''Film/OnceUponATimeInTheWest''. Henry Fonda, CastAgainstType as Frank, initally wanted to drastically change his usual appearance by growing a beard and wearing brown contacts. Sergio Leone told him not to do it, as the shock of seeing Fonda as such a character was exactly why he hired him, and it would work best if he looked like he usually did.
* Lon Chaney Senior took this to UpToEleven
* ''Film/DragonTheBruceLeeStory'': To play BruceLee, Jason Scott Lee (no relation) trained with Jerry Poteet, who was a student of the real Lee.
* The whole cast of ''Film/TheWizardOfOz'' had to suffer with long shooting schedules and the hot lights required for early Technicolor. But three in particularly were fit most for the trope due to heavy make-up: Margaret Hamilton (could not eat and remained on a liquid diet, the copper-based Wicked Witch make-up got burned by malfunctioning pyrotechnics), Bert Lahr (had the liquid diet before he decided to get his make-up redone everyday, the Cowardly Lion suit made of real lion skin made him sweat profusely) and Jack Haley (the Tin Man suit was so stiff that he had to lean against a board to rest; the make-up needed some changes as it previously caused [[TheOtherMarty the actor Haley replaced]] to get hospitalized).
* For his ''Paganini'' movie, KlausKinski demanded from his dentist to pull ''all'' of Kinski's teeth, since the real Paganini had lost them. The dentist declined, since pulling perfectly healthy teeth isn't a dentist's job. Kinski reacted with one of his tantrums, but kept his teeth nonetheless.
** Kinski shaved his head to play Dracula in ''{{Nosferatu}}''. When he reprise the role (sort of) in ''Vampire in Venice'' he refused to shave his head again. In ''{{Woyzeck}}'' Kinski has the buzzcut one would expect a soldier to have, appearing to be this trope, but in actuality the movie was filmed only five days after ''Nosferatu'' wrapped and that was all the hair he could grow in the five days.
* Creator/DanielDayLewis is the ''Mad Emperor'' of this trope, often engaging in obsessive levels of research and/or training to prepare for a role, sometimes [[CloudCuckoolander completely vanishing inside them]].
** ''The Boxer'': trained as a boxer to the point where he could actually have been ranked professionally if he were so inclined.
** ''InTheNameOfTheFather'': lived in a prison cell and asked the crew to abuse him.
** ''Film/MyLeftFoot'': refused to get out of character for the entire film shoot, actually suffering damage to his ribs from maintaining the same position for so long.
** ''Film/TheLastOfTheMohicans'': rigorous period-appropriate survivalist training, learning to hunt and live off the land.
** ''Film/GangsOfNewYork'': trained as a butcher and learned knife-throwing. Sought out old voice recordings to get as close to a period-appropriate New York accent as possible.
** For ''Film/TheCrucible'', he built the house that John Proctor (his character) lived in in the film, and didn't shower or bathe at all during filming...''and this was the film in which he met his wife, Rebecca Miller...''
* For ''Film/ApocalypseNow'' Creator/MarlonBrando shaved his head to play Kurtz. To Coppola's chagrin, that's all he did to prepare for the part. He was supposed to lose weight for the role of Kurtz, but he showed up extremely obese.
* To play [[AppleMacintosh Apple]] co-founder Creator/SteveJobs in the 2013 biopic ''Jobs'', Ashton Kutcher followed a fruitarian diet similar to the real Jobs. At one point, he ended up being hospitalized for abnormal pancreatic levels (which is particularly unnerving considering Jobs had died from pancreatic cancer).
* In-universe, the title character in ''Film/DickieRobertsFormerChildStar'' tells Creator/RobReiner that he's willing to dye his hair and have any neccessary plastic surgery in order to play the lead in "Mr. Blake's Backyard" (after Reiner tells him he has the right basic look). He never gets plastic surgery, but during his time being treated like a child, he briefly dyes his hair in order to avoid being recognized by fans.
[[/folder]]

[[folder:Live-Action TV]]
!!!Hair change:
* Adrian Pasdar grew a beard for the second season of ''Series/{{Heroes}}.'' It was so impressive it [[http://www.urbandictionary.com/define.php?term=pasbeard had its own nickname]].
* Music/ArianaGrande dyed her hair the color of red velvet cupcakes when she was cast as Cat Valentine in ''{{Victorious}}'', to avoid having a cast completely of people with dark brown hair.
* AshleyTisdale had her hair dyed from brunette to blonde when she did ''TheSuiteLifeOfZackAndCody''. She later went back to being brunette after the ''HighSchoolMusical'' movies, but when she reprised her role as Sharpay in ''Sharpay's Fabulous Adventure'', she instead used a blonde wig, averting the trope. She later went back to blond in mid 2011 and [[DyeHard has stayed that way since.]]
* Bruce Boxleitner grew a beard that he found very annoying for the last season of ''Series/BabylonFive'', at J. Michael Straczynski's insistence that his character be visually different to reflect his development.
* Chloe Annett, TheOtherDarrin in the role of Kochanski on ''Series/RedDwarf'', had her long light brown hair cut short and dyed dark brown so that she'd look more like her predecessor Clare Grogan when she took the role in Series VII. In Series VIII, she had her own natural hair (despite the fact that the series premiere took place a matter of minutes after the previous series' finale - the change in appearance was never commented on).
* Daniel Roche, a child actor known for having long hair in sitcom ''{{Outnumbered}}'', got a short back and sides to star in ''Literature/JustWilliam''.
* Diane Neal, as [[LawAndOrderSVU Casey Novak]], never had the same hair color two seasons running, ranging from [[ReplacementScrappy painfully Alex Cabot-esque]] blonde to bright red.
* Ed Bishop dyed his hair white-blond for the role of Commander Straker in ''Series/{{UFO}}'', as the character's look was based on a character voiced by Bishop in ''Series/CaptainScarletAndTheMysterons'', Captain Blue, but soon switched to a wig because the dye damaged his hair.
* Eva Habermann dyed her hair blue to play Xev Bellringer on {{Lexx}}. Due to hair damage from the dye, she had to switch to a wig in the second season.
* Gillian Anderson was asked to cut and dye her naturally long blonde hair into an auburn bob for the part of Dana Scully on ''Series/TheXFiles''. It was left long and blonde for the 2008 movie ''I Want to Believe,'' which fit well with the character (who was supposed to be in hiding), but outraged fans at the change from the Scully they knew.
* [[MarxBrothers Groucho Marx]] never had a mustache most of his career; the comedic one he's always depicted with was a fairly obvious greasepaint job. When ''You Bet Your Life'' came along in his late career, he refused to do the old greasepaint routine but agreed to grow a real mustache so that fans would recognize him.
* Jason Lee grew Earl's trademark 'stache for ''Series/MyNameIsEarl'', because he felt like the character needed one.
* ''Series/BuffyTheVampireSlayer'' and ''Series/{{Angel}}'':
** James Marsters dyed his hair platinum to play Spike.
** The three leading actresses on ''Buffy'' all had brownish auburn hair when they were cast. Sarah Michelle Gellar became gradually blonder and eventually bleached blonde by season 2 (producers wanted the character to look more like a ValleyGirl). Alyson Hannigan went full redhead to be Willow. Charisma Carpenter at the time had blonde highlights but darkened hers to play Cordelia.
** Seth Green dyed his red hair both brown and blond at several points in the show. It became a quirk of his character's.
* Anna Hutchinson had to cut and dye her long blonde hair brown and into a mullet for her role in the soap opera ''Shortland Street''. She was eventually allowed to let her natural hair grow out. Ironically averted for her role in ''Film/TheCabinInTheWoods'' where her character Jules has just dyed her hair blonde.
* Kasey Rogers, the second actress to portray Louise Tate on ''Series/{{Bewitched}}'', originally dyed her red hair dark brown to more closely resemble Irene Vernon, the actress she replaced. In later episodes, she reverted to her natural hair color.
* [[KatieMcGrath Katie [=McGrath=]]] dyes her naturally blonde hair very dark and "stays out of the sun" to play RavenHairIvorySkin Morgana on ''Series/{{Merlin}}''.
* Leighton Meester, a natural blonde dyed her hair chestnut brown because Blair Waldorf is described as a brunette in the ''GossipGirl'' books.
* Linda Thorson joined ''Series/TheAvengers'' as a SuspiciouslySimilarSubstitute for [[ActionGirl Emma Peel]]. She was supposed to dye her hair blonde to differentiate her from her predecessor, Diana Rigg. The treatment made her hair fall out, so in some early episodes she's wearing a brunette wig, while in others (e.g. "All Done With Mirrors") her hair is very short.
* Mackenzie Crook, who played Gareth in ''TheOffice'', said that he has his character's unflattering bowlcut in his wedding photos, captured for posterity.
* Majel Barrett, having been fired from the original ''Series/StarTrekTheOriginalSeries'' pilot, cut and bleached her hair blond to audition for the role of Christine Chapel. Strangely, ThePowersThatBe didn't seem to notice.
* Mark-Paul Gosselaar, whose hair color had darkened as he went through puberty, had to dye his hair and have touch-ups before each episode of ''SavedByTheBell''. His dark roots usually showed though.
* Michael Rosenbaum shaves his head to play Lex Luthor in ''{{Smallville}}''. The actress for Maxima also dyed her hair from gold to red. Unfortunately, [[AdaptationDyeJob no one did anything for Lana Lang or Lois Lane.]]
* Mike Lookinland, the auburn-haired child actor who played Bobby Brady on ''TheBradyBunch'', was forced to dye his hair jet black to more closely resemble his TV father and brothers. In later seasons though, his natural color returned.
* Mollie Sugden, who played Mrs Slocombe in ''Series/AreYouBeingServed'', had to have brightly-coloured hair which changed colour every episode. At the start this was done by actually dyeing Sugden's hair, but the treatment caused reactions and hair loss so the production switched to a series of brightly-coloured wigs from then on.
* Natalie Dormer is a natural blonde - she dyed her hair black to play Anne Boleyn on ''TheTudors''.
* RoseMcGowan dyed her hair brown for a part as a brunette in ''Series/{{Charmed}}'' but a potion blew up and she was a red-head again.
* Sacha Baron Cohen's actual facial hair is used for AliG and ''Film/{{Borat}}''. He also shaved his body hair to play ''Film/{{Bruno}}''.
* Creator/StephenColbert had his head shaved to show solidarity for the troops when he took his show to Baghdad. It was hyping up having President BarackObama give the order to shave it, which was carried out by Gen. Ray Odierno, commander of the American forces in Iraq at the time. He made a RunningGag out of complaining about how slowly it was growing back.
* Virginia Hey shaved her head and ''eyebrows'' to play Zhaan in ''Series/{{Farscape}}''. She was eventually forced to leave the show because the huge amounts of makeup were causing her serious skin and kidney issues.
* Series/DoctorWho:
** Mark Strickson, to play Vislor Turlough, was required to dye his blond hair red. This was to avoid him being confused with the blond Peter Davison in long shots. This was a peculiar worry of the producer's, who also feared the audience would confuse Tegan (a twenty-something woman who normally wore a lilac air hostess uniform) and Adric (a teenage boy usually to be seen in a yellow and red pyjama-like costume). Well, they do both have brown hair.
** Creator/PeterDavison had his hair highlighted to play the title role. This is particularly noticeable as it is considerably darker during his brief appearance at the end of ''Logopolis'' than it is in ''Castrovalva'', despite the fact that the latter is supposed to follow on immediately after the former.
** They must have loved this trope in TheEighties: Colin Baker was blonded up, too. He actually gets slowly blonder and blonder during his run, with big jumps in colour between stories which happen immediately after each other, which again makes it very noticeable. At least it would fit the vain personality of the Sixth Doctor to bleach his hair - in the game ''The Eternity Clock'', River Song suggests that he does.
** Even Tom Baker's Doctor went a bit blond in the 1980s, though this was to disguise his grey hairs. He went from dark brown to golden brown.
** And a Doctor from blond to dark - Christopher Eccleston's hair colour is naturally a blondish light brown, but he died it black to play the Doctor.
** Louise Jameson wore brown contacts during her first season of playing Leela. At the end of ''Horror of Fang Rock'', the first serial of her second season, an in-show reason was given to have have her eyes change from brown to blue (her natural color).
** Nicholas Courtney's Brigadier moustache was fake at first, but after his first couple of seasons he decided to just grow it for real.
** The Fourth Doctor's sideburns. They started out as the normal sideburns everyone had in the 1970s, but when the costume designers decided the character should take on a Byronic appearance, they were grown out into long Victorian muttonchops which very few people had in the 1970s.
** Honorable mention: When he auditioned, Paul [=McGann=] had a similar hairstyle to the one he has as the Eighth Doctor, but then he decided to shave his head. They made him wear a wig (which he absolutely hated) to get back the long curls, which had to be glued to his head, and his scalp had a reaction to the glue so his skin started flaking off. It's not an intentional example, but still, the poor guy's skin started coming off. It counts.[[note]]Amusingly, for nearly three weeks, Eric Roberts didn't recognize him when he took his wig off.[[/note]]
* Series/{{Skins}}:
** Lily Loveless, naturally brunette was bleached twice and toned to peroxide blond.
** Megan Prescott's hair was dyed bright red to match her twin Kathryn, who had walked in with her hair already dyed red: The stylists decided to ThrowItIn.
** Dakota Blue Richards cut her hair short for the role of Franky Fitzgerald.
* Bryan Cranston shaved his own head on camera for ''Series/BreakingBad'', though the scene was cut out.
* ''Series/{{Castle}}'' has an in-universe example with Natalie Rhodes. In order to be closer to Beckett's style (since Nikki Heat was based on her), she dyed her hair from blonde to brunette.
* Pasquale Finicelli, an actor with naturally [[http://www.beehive.it/Pasquale_Finicelli_file/Pasquale.jpg dark brown hair]], had to dye it [[http://www.lorenzone.it/wp-content/uploads/2000/01/mirko.jpg blond with a red forelock]] in order to play Mirko in the Italian teen soap opera ''Love Me Licia'' (a live-action adaptation of the manga AishiteNight, where the male lead Go had AnimeHair like that).
* In ''Series/{{Sherlock}}'', both BenedictCumberbatch (as Sherlock Holmes) and Creator/MarkGatiss (as Mycroft Holmes) dye their hair black. They're both naturally ginger.
* In the Granada ''Series/SherlockHolmes'' series, David Burke, the first Dr. Watson, dyed his grey hair and mustache auburn to make himself look much younger.
* William Petersen kept his almost-white hair dyed darker to a gray shade for the later years of his role as Gil Grissom on Series/{{CSI}}. It does appear a bit more natural in his season 11 cameo, however.
* Adrian Paul used hair extensions for the first season of ''Series/{{Highlander}}: The Series'' and then grew it long for the next four. He cut it for season six because he was tired of caring for it.
* Poppy Montgomery decided to become a redhead for ''Series/{{Unforgettable}}''.
* Léonie Berthonnaud, playing Aelita in ''Series/CodeLyokoEvolution'', had her hair sprayed pink for filming.
* Many current Creator/DisneyChannel Stars sport a hair color different from there natural color. It's still probably too soon to know whether they're DyeHard or doing it for their art, but to name a few.
** Creator/DebbyRyan dyed her hair auburn for the role of ''Series/{{Jessie}}''.
** G. Hannelius, a natural brunette, dyed her hair blonde to do DogWithABlog, possibly to match her mom's blonde hair, who has redhead in a flashback.
** ''Series/GoodLuckCharlie'' has a major dose of this. Leigh-Allyn Baker is blonde as Amy Duncan, but was a redhead on ''Series/WillAndGrace''.
*** BridgitMendler also has blonde hair as Teddy but showed an old school photo of herself in an episode with red hair, and complained about about not being able to get a suntan in another episode. That is a common complaint for redheads.
* Kevin Tighe, naturally auburn-haired, bleached his hair for earlier ''{{Series/Emergency}}'' seasons, to a lighter blonde with more red. It returned to its natural darker color later on. Randolph Mantooth and Tim Donnely had to cut their hair to meet fire dept. standards. Randy always favored longer hair back then and kept pushing things during the series. Gage being told to get a haircut was put into an inspection scene. Donnelly favored his bushy, curly hair and PornStache and had them back by series end.

!!!Weight change/Other:
* JewelStaite was asked by JossWhedon to put on 20 pounds to play Kaylee in ''Series/{{Firefly}}'', which she did. She lost it when the show was canceled, but did not regain it for ''Film/{{Serenity}}''. She also dyed her hair to play Dr. Jennifer Keller in ''Series/StargateAtlantis''.
* Kiefer Sutherland got a real tattoo for ''[[Series/TwentyFour 24]]''. In one season, Jack Bauer gets a gang tattoo. In order to avoid hours of makeup every time, Sutherland just got the real thing done.
* MargaretCho, shooting her short-lived sitcom ''Series/AllAmericanGirl'', was forced to lose weight [[HollywoodPudgy to]] play [[RealityIsUnrealistic herself.]] She lost 30 pounds in three weeks and her kidneys collapsed as a result.
* Pauley Perrette got a number of her ''Series/{{NCIS}}'' character Abby Sciuto's tattoos done for real (but not all of them).
** She already had a lot of tattoos. The spiderweb is not real.
** Her hair has also been dyed from her natural blonde to the more well-known black - for the past ''seven years''.
* SummerGlau was accidentally hit in the face with a brass casing that left a small scar while training to handle weapons for ''TheSarahConnorChronicles''. Rather than have it removed by makeup, Summer instead [[ThrowItIn kept it]] to help make the character of Cameron more convincing.
* Tim [=McInnerny=], in the fourth series of ''{{Blackadder}}'', gave his character Darling an eye twitch that became a real tic over the repeated takes. He didn't lose it until months after the series ended.
* Tom Fontana, series creator of the prison drama ''Series/{{Oz}}'', volunteered to be the man receiving an upper-arm tattoo of the show's logo. He even asked for the tattooing to be re-shot so as to get it perfect, but the tattoo artist refused, claiming if he applied the needle any longer, Fontana might die.
* Tricia Helfer dyed her dirty blond-brown hair platinum to play Six on the reimagined ''Series/{{Battlestar Galactica|Reimagined}}'', but she switched to a wig a few episodes into the first season because the bleach was causing hair issues (namely, falling out in chunks), which explains how she was able to be both natural haired Gina and platinum Six.
** In the same series, Edward James Olmos wore blue contact lenses and Jamie Bamber dyed his dark blond hair brown, so that they would look more like father and son.
** Jamie Bamber dyes his hair brown for many of his roles.
* Shea Whigham lost weight in between seasons of ''Series/BoardwalkEmpire'' to look appropriately gaunt after his character served 18 months in jail during a TimeSkip.
* Rob [=McElhenny=] (Mac) gained 50 lbs for the seventh season of ''It's Always Sunny in Philadelphia,'' and lost most of the weight as the season progressed. He has explained that making his character get fat was part of the sitcom deconstruction that the show is aiming for.
* In addition to dying his hair, Creator/BenedictCumberbatch also lost a lot of weight for the independent film ''Film/ThirdStar'' instead of opting to shave his head. He kept it this way for ''Series/{{Sherlock}}, which he justified by pointing out Sherlock almost never eats unless he has to, but regained a bit by the second series.
* Michael Rooker lost 20 pounds to reprise his role as Merle Dixon on ''Series/TheWalkingDead''.
* Creator/MaisieWilliams learned to swordfight with her left hand, despite being right-handed herself, in order to properly portray Arya Stark on ''Series/GameOfThrones''.
[[/folder]]

[[folder:Music]]
* [[EnforcedTrope Enforced]] with the rather shameful example of ''castrati''. Back in the earlier days of {{Opera}}, when prepubescent boys with good singing voices would be castrated so that their voices wouldn't break (and therefore ruin their ability to hit the high notes that composers were so fond of putting in their compositions). This practice eventually died out: ''castrati'' were frequently cast as women--which made sense in an age where few women took up acting or singing in operas, which was seen as unladylike somehow. When female opera singing became more socially acceptable, and stealing the manhoods of little boys was not, the practice gradually disappeared, and was finally banned in its primary center (Italy) in 1861 (shortly after unification).
** The practice is also a bit of FridgeHorror when you consider that for many boys who underwent "the operation," other factors--ranging from the occasionally-lethal doses of opium administered to block the pain of the procedure to simple "your voice isn't good enough"--prevented them from actually singing upon reaching adulthood.
* Till Lindemann got a hole pierced in his cheek so he could run a LED light through it for most of Music/{{Rammstein}}'s "Ich tu dir weh" video (It closed up during filming when he lost the plug keeping it open.).
* Gerard Way of MyChemicalRomance bleached his hair white to portray a dying cancer patient in TheBlackParade era.
* Vocal fold operation is quite common for professional cante flamenco singers.
* It's rumoured that some ballerinas will have their toes broken and reset to be better "en pointe," or to have their ribs removed to be thinner or change their body shapes.
* TinaTurner famously fried her hair while dyeing it. She's worn wigs since the early 1960s.

[[/folder]]

[[folder:Professional Wrestling]]
* Anytime someone loses a Hair-vs-Hair match.
** Arguably the best example was Molly Holly. Originally during Wrestlemania XX, a Women's Championship match was not on the card. She decided that she needed to do something to get the Women's Title on Wrestlemania, so she offered her hair for it.
** Molly did this more than anyone. When she initially debuted as Miss Madness in WCW she bleached her hair blonde and glammed herself up to look like a pageant queen. When her character underwent a FaceHeelTurn she darkened her hair to autumn brown and cut it (half symbolic to fit the new character, and half practical as her hair had been fried from years of bleaching). Then came the head shave...
* For a while after he became the Hurricane, Shane Helms dyed a strip of hair on top of his head green. To get the green to stand out, he had to bleach his hair first. All the dyeing fried his hair and he had to stop.
* KurtAngle, after losing a Hair-vs-Hair match, wore a (bad) toupee for a while. In true heel fashion, he would [[RantInducingSlight freak out]] when someone pointed out it was a toupee. Once the toupee comedy ran its course, he debuted his bald look by whipping the toupee off and smiling until the fans quit heckling him.
* For a good amount of time, Wrestling/NatalyaNeidheart dyed her naturally blonde hair red, because there were too many blonde Divas in WWE. She's since gone back to her natural hair color, but with pink streaks as part of her new gimmick embracing her Hart heritage, whose signature colours were pink and black.
* John Tenta had his LSU tiger tattoo changed to a shark to fit his new gimmick. Later as part of an angle he shaved one half his head bald, leaving the other half bearded and skulleted.
* Wrestling/JillianHall felt she wanted to get breast implants when she was in OVW and Jim Cornette decided it would become her gimmick so she bleached her hair blonde as well and the storyline was that the implants leaked into her brain and turned her into a DumbBlonde.
* Roxxi Laveaux in TNA dyed her hair various colours to fit with her Voodoo Queen gimmick. The dye ended up stripping her hair which led to another example of the trope - where she infamously had her head shaved at the 2008 ''Sacrifice'' PPV.
* ZackRyder initially debuted in WWE with long red hair. When he was given his "Long Island Iced Z" gimmick, he cut his hair short and bleached it as well as tanning excessively to fit the character.
* Serena Deeb had her head shaved bald on her Smackdown debut when she joined CMPunk and his Straight Edge Society. Reportedly, producers had gone around asking all the developmental Divas and Serena was the only one willing to have her head shaved. Punk himself later followed through on this and had his head shaved as a result of losing a match. Adding to the effect was the fact that the shaving had to happen while he had staples in his head from a cut during the match.
* Madison Rayne went a few shades lighter to platinum blonde and gave herself black streaks when she joined The Beautiful People in TNA. When she switched characters to a RichBitch instead she dyed her hair brown.
* Snitsky (a.k.a. Gene Snitsky) revamped his [=WWE=] character to be more of a psychopath, and to that end, he not only shaved his head, but dyed his teeth dark yellow.
[[/folder]]

[[folder:Theater]]
* TimCurry dyed his hair blonde during the stage production of ''[[RockyHorrorPictureShow The Rocky Horror Show]]''.
* Megan Hilty dyed her hair brown near the end of her Broadway run as Glinda in ''Theatre/{{Wicked}}'', and kept it through her run as Mary in TheMusical of ''Vanities'', but wore blonde wigs for both characters.
* In We Will Rock You the Character of Scaramouche has Purple hair which is very obviously dyed from brown or black, the actress, depending on the production, may be asked to dye, or have their hair dyed purple for the role.
* David Thaxton dyed his hair a lighter shade of blond when he was playing Enjolras in ''Theatre/{{Les Miserables}}''
[[/folder]]

[[folder:Theme Parks]]
* At Theatre/HalloweenHorrorNights 2010, all of the actors in the Havoc: Dogs of War house were required to shave their heads to more accurately play genetically-altered super-soldiers, including the girls. This has led to some surprisingly good reviews of the house so far, despite being predicted as that year's flop, as the cast arguably consists of the most dedicated performers in the whole event. Some of them have gone ''slightly'' nuts in their performances and risked damaging sets.
[[/folder]]

[[folder:Web Originals]]
* Jermaine of ''Webvideo/{{Awkward}}'' got his buzzed mohawk look to look authentically douchey. He had to keep it that way for two months.
* {{Website/Cracked}} has a few [[http://www.cracked.com/quick-fixes/4-actors-who-went-through-physical-torture-stupid-movies/ maligned examples]] here (except number one, which is more MethodActing).
* Jodi Behan the titular bride in the famous viral video "Bride Has Massive Hair Wig-Out" did indeed cut off her hair for the video. She actually got the starring role because she was the only one of the four actresses willing to do so.
[[/folder]]

[[folder:Western Animation]]
* Referenced in-universe in ''WesternAnimation/TheSimpsons''. In one episode, [[TheAhnold Rainier Wolfcastle]] is seen coming out of a convenience store, grossly overweight and in the middle of gorging himself further. Wolfcastle informs his onlookers that he's preparing for a role as a fat secret agent.
[[/folder]]
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