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!!Films — Animated
* At the climax of ''WesternAnimation/AllDogsGoToHeaven2'', [[BigBad Red]] assumes his gigantic true form after [[spoiler: capturing all the dogs in Heaven with Gabriel's Horn]]. Truthfully, it's just an incredibly massive and more demonic version of his base form, but is still enough to prove a major problem...[[spoiler: until Charlie discovers his [[KillItWithWater weakness]].]]
* In ''WesternAnimation/{{Bionicle}} 2'', [[BigBad Makuta]] [[DevourTheDragon consumes his two hired bounty hunters]] and his pet bird Nivawk to turn his weak, depowered body into a giant, winged titan. [[http://biosector01.com/wiki/index.php/File:LoMN_Winged_Teridax.PNG His movie design]] was [[ShowAccuracyToyAccuracy just the model from the first film with wings]], but [[http://biosector01.com/wiki/index.php/File:Set_Ultimate_Dume.png the toy]] was a true monster.
* In TheFilmOfTheBook of ''WesternAnimation/{{Coraline}}'', after The Other Mother loses her temper with Coraline and tries to stop her from escaping, she gets [[GlamourFailure less and less human-looking]]. At first, she simply becomes [[LeanAndMean inhumanly tall and gaunt]]; at the climax, [[spoiler:she turns into what is best described as a spider-woman with skin covered in cracked porcealin and limbs made from sewing needles.]]
* ''WesternAnimation/DespicableMe2'' has the BigBad using a PsychoSerum to turn himself into a giant furry monster.
* [[Franchise/DisneyAnimatedCanon Disney]] '''loves''' this Trope:
** The Queen's "perfect disguise" in ''WesternAnimation/{{Snow White|AndTheSevenDwarfs}}'' certainly counts, depending whom you ask; it's absolutely terrifying enough and--more importantly--it reflects the Queen's true nature. ''Supremely'' ironic given that the Queen wants to be "Fairest of Them All".
** In ''WesternAnimation/SleepingBeauty'' Maleficent turns into a dragon to fight Prince Philip, as pictured in the trope's main page.
--->'''Maleficent''': Now shall you deal with me, O Prince, and all the powers of '''''Hell!'''''
*** Disney parodied that scene as early as ''WesternAnimation/TheSwordInTheStone'', when Mad Madame Mim comes very close to ending her [[ShapeshifterShowdown Wizard's Duel]] with Merlin by turning into a goofy-looking Dragon. [[spoiler: Then Merlin wins by turning into an infectious disease.]] Given how germs work, this means that [[FridgeHorror her body is full of millions of tiny transformed Merlins....]]
** In ''WesternAnimation/TheLittleMermaid1989'', when [[spoiler:Ariel doesn't get Eric's kiss within the time limit]], Ursula [[spoiler:allows King Triton to trade himself for his youngest, and she takes his trident and]] uses it to turn into a giant version of herself. Then [[spoiler:Eric crashes his ship into her, impaling her and also electrocuting her, oddly.]]
** In ''WesternAnimation/{{Aladdin}}'' Jafar turns into a [[ScaledUp giant cobra]], then into an "all powerful" genie. The thing is, [[GuileHero Aladdin actually tricked Jafar]] into wishing he was a genie, so he'd be trapped in a lamp.
*** This seems brilliant only in the context of the rules set by the film; Aladdin used a ChekhovsGun of a comment of the genie's back at the oasis. The actual djinni even in the proper translated Thousand And One Nights are enslaved in precisely one story: Aladdin, which features a 'slave of the ring' and a 'slave of the lamp.'
*** There was a mysterious slave from nowhere that dumped the transformed fish in the fire in 'The Fisherman and the Genie.' He may have been a genie himself, although the title character was just shut up in a jug so long he resolved to kill whoever let him out.
*** Played with in ''WesternAnimation/AladdinTheReturnOfJafar'' in that it's actually his original, real form at the start of the film, but Jafar decides to transition back into his gigantic Genie self for the final battle instead of the human he looked like for most of it. Unlike the first film, it's not in any way a ClippedWingAngel.
** Appropriately for an AffectionateParody of their own movies, the villain of ''Film/{{Enchanted}}'' turns into a big dragon [[EvilGloating who will NOT shut up]].
*** "[[YoureInsane You're crazy!]]" "No. Spiteful, vindictive, VERY large but ''never'' crazy."
** Parodied in ''WesternAnimation/TheEmperorsNewGroove'': Yzma is exposed to one of her own potions, and emerges laughing maniacally from a huge cloud of smoke only to be revealed as... [[spoiler:a CuteKitten]]. Surprisingly, [[KillerRabbit her new form allows her to nearly get the potion several times and be a worse threat then she was as an old woman]], subverting [[ClippedWingAngel Clipped-Winged Angel]] as well.
*** In an even more comical version, ''Kronk's New Groove'' features Yzma using a potion that will turn her into something that her enemies (in this case a bunch of old people who she sold fake potions to) cannot harm... [[spoiler:[[BunniesForCuteness a cute little bunny]]]]. Unfortunately for her, while they don't harm her, [[spoiler:the local condor doesn't mind taking her for food]].
*** In one episode of ''WesternAnimation/TheEmperorsNewSchool'' Yzma does turn into a giant snake. And in another episode she and Kuzco have a transformation potion duel--one of the things Yzma turns into is a Tyranosaurus Rex.
*** And she once made a potion that would turn her into the most hideous, terrifying thing imaginable, so frightening the other wouldn't be able to do anything about her... comically subverted when the potion does nothing, implying that she already is.
*** In the video game for the film, Yzma actually attempts to do this on the last level of the game by drinking a potion...[[spoiler: and, true to the film, ends up becoming a cute little kitten. She and Kuzco then race each other for the human potion.]]
--->'''Yzma:''' *holding a potion* Ahhh, Kuzco, I'm glad you made it. Now, with this potion, I will turn myself into a hideous monster, and [[LargeHam END YOUR RULE FOREVER!!!!]]
--->'''[[DeadpanSnarker Kuzco]]:''' Are you sure you didn't drink it already, you old bag of bones?
** In ''WesternAnimation/WreckItRalph'', [[spoiler:King Candy/Turbo is eaten by a Cy-Bug. He takes it over and becomes a massive fusion of himself and the Cy-Bug.]]
--->[[spoiler:'''Turbo-bug]]:''' Welcome to the [[LargeHam BOSS LEVEL]]!
** Downplayed in ''WesternAnimation/{{Frozen|2013}}'' with Elsa's [[{{Snowlems}} snow creature]] "[[FluffyTheTerrible Marshmallow]]" (as named by Olaf). Already intimidating to begin with, making him angry causes him to sprout giant ice spikes and send him on a rampage.
** ''WesternAnimation/AtlantisTheLostEmpire'' has [[spoiler: Rourke become this after being sliced by a shard of glass infused with Atlantean magic, turning him into a shrieking, violent crystal golem with glowing red eyes and a glowing red mouth]]. In addition, [[spoiler: Kida has a non-combative form after being fused with the city's HeartDrive. Fortunately, she's released when the danger is overcome]].
* Creator/DonBluth likes Disney movies as well and has used this at least twice:
** In the already insane ''WesternAnimation/RockADoodle'', the Grand Duke appears to puke his evil magic up all over himself and mutates into a sort of gigantic owlish... tornado-ish... thing...
** The spin-off movie ''WesternAnimation/BartokTheMagnificent'' has Ludmilla (voiced by Catherine O'Hara of ''{{Series/SCTV}}'') steal a potion that Babayaga has given Bartok to aid him in his quest - it turns you into whatever you are, deep down inside. She drinks it and...
** Creator/DonBluth actually worked for Disney around the time of movies like ''WesternAnimation/TheRescuers'', so he was just carrying on the tradition.
* Hexxus in ''WesternAnimation/FernGullyTheLastRainforest''. After Hexxus' power source from human pollution is disconnected his smoke form dissipitates, and it momentarily seems like he's defeated. Then he harnasses his own power and transforms into a giant, black, cloaked skeleton made out of fire and tar. It's hinted to be his real form, as it's glimpsed earlier in the film during his VillainSong.
* Kadaj, in ''Anime/FinalFantasyVIIAdventChildren'', transforms into no less than the TropeNamer himself. Shortly after being super-[[LimitBreak Omnislashed]], Sephiroth proceeds to show his lone black wing, before leaving Kadaj to go through the whole 'dying' process.
** In ''Advent Children Complete'' the wing appears before Sephiroth is Omnislashed, and he uses it to do a number on Cloud.
* During the climax of ''Animation/TheFrogPrincess'', Koshchei turns into a giant crow to battle Ivan.
* Joe, the villain of ''WesternAnimation/HelpImAFish'' does an odd inversion of this. He starts out as an ordinary fish, granted human intelligence via the "anti-fish" potion. During his final confrontation with the hero, he begins drinking more and more of the potion to boost his intelligence, which causes him to turn into a human. The next question he gets asked is "Can a human breathe underwater?" He, of course, can't, and promptly drowns.
* Heroic example in ''Anime/HowlsMovingCastle''. Near the end, Howl transforms himself into a giant flying bear/wolverine-eagle thing to fight off bombers.
* During the climax of ''WesternAnimation/KuboAndTheTwoStrings'', [[spoiler:the Moon King transforms into a ghostly dragon that resembles a cross between a millipede and a ''Dunkleosteus''.]]
* ''WesternAnimation/MonsterHouse'' contains one of the most bizarre versions of this ever. Bizarre, because the BigBad in question is a '''''house''''' that has [[ExactlyWhatItSaysOnTheTin transformed into a monster]].
* ''WesternAnimation/MyLittlePonyEquestriaGirls'':
** Sunset Shimmer transforms into a [[WingedHumanoid winged]] [[BigRedDevil red devil]].
** In the final showdown of ''WesternAnimation/MyLittlePonyEquestriaGirlsRainbowRocks'', the Dazzlings get evil versions of the Rainbooms' anthro-pony transformations, with leathery wings and [[GlowingEyesOfDoom glowing]] [[RedEyesTakeWarning red eyes]]. They up the ante even further with magical projections of their true siren forms.
** [[spoiler:Human Twilight Sparkle, of all people]] ends paralleling Sunset Shimmer in the first movie -- she is accidentally turned into an insane monster that is powerful enough to almost destroy the whole human dimension in ''WesternAnimation/MyLittlePonyEquestriaGirlsFriendshipGames''.
** Gloriosa Daisy turns into a dark nature spirit in ''WesternAnimation/MyLittlePonyEquestriaGirlsLegendOfEverfree'', which is her own version of a creature mentioned in a campfire tale.
** Juniper Montage pulls it at the end of [[WesternAnimation/MyLittlePonyEquestriaGirlsMagicalMovieNight her miniseries of episode-length specials]], turning into a giant version of the glamorous self she wished to be.
** To the surprise of many, [[spoiler:Wallflower Blush]] averts it in the climax of ''WesternAnimation/MyLittlePonyEquestriaGirlsForgottenFriendship''. As one of the writers put it, "Appreciating that YOU appreciate that [[spoiler: Wallflower]] didn't turn into a kaiju-demon-stomper threatening to devour the school. Sometimes the biggest stakes are invisible."
* Simone Lenoir, Lena Dupree, and Jacques undergo this trope in the finale of ''WesternAnimation/ScoobyDooOnZombieIsland'' when they transform into hideous, mindlessly snarling, spiritual life energy draining vampires that look like were-versions of cats. It is implied that this is their true form after they made a deal with the statue of an eldritch Cat God that is supposedly an evil version of Bast.
* Appropriately for a film that (ahem) was an intentional homage to the classic films, Rothbart in ''WesternAnimation/TheSwanPrincess'' has the ability to become "The Great Animal". His monstrous true form was teased throughout the entire movie until the very end - only to have him bring the {{Narm}} and change into what appears to be a big fruitbat.
** [[NightmareFuel Your Mileage May Vary.]]
* In ''WesternAnimation/TurningRed'', when Ming's red panda spirit is released, she goes completely berserk, becoming a kaiju-sized monster.

!!Films — Live-Action
* In one of the ''Series/AlienNation'' films, the BigBad takes a massive overdose of the MacGuffin slave-drug, seemingly dying, and then...
* ''Film/Aladdin2019'', like the original, also has such a moment. [[spoiler:Just like the ''Maleficent'' example listed below, however, it's [[NotHisSled not Jafar]] who undergoes such a transformation into a big cobra: instead, he turns ''Iago'' into a [[RocBirds rukh]] and sends him after Aladdin and Jasmine, who are trying to fly out of Agrabah on the Carpet, taking the Lamp with them. Rukh!Iago does a really good job of it, successfully snatching the Lamp from Aladdin, but then the Sultan briefly knocks Jafar's staff out of his hands, [[NoOntologicalInertia causing Iago to return to normal and nearly fall out of the sky under the increased weight of the lamp in his parrot feet]]. Jafar does end up becoming a genie, as per the original film, but as per the original, this transformation is more of a ClippedWingAngel.]]
* According to the bonus features on the DVD of the first ''Film/{{Blade}}'' movie, this was the original ending of the film, with villain Deacon Frost transforming into the blood god La Magra (who looked like a giant CGI red tornado). However, the filmmakers were struck with a jolt of good sense and realized that it would detract from the climax, having just spent the entire film building up Frost as the main villain. Instead, [[spoiler:La Magra possesses Frost, granting him nigh-invincibility and fighting prowess]].
* ''Film/ChipNDaleRescueRangers2022'': [[spoiler:Sweet Pete]] gets an unwilling instance of this when his modification machine malfunctions and starts zapping him repeatedly, turning him into a disjointed mashup of animated characters, with a CG version of the heads of [[WesternAnimation/TheGreatMouseDetective Felicia]] and [[WesternAnimation/TheAristocats Marie]], [[WesternAnimation/TreasurePlanet Silver]]'s coat, WesternAnimation/WreckItRalph's left arm, [[Franchise/ToyStory Sheriff Woody]]'s right leg, [[WesternAnimation/TeenageMutantNinjaTurtles1987 '87 Shredder's shoulder (and voice)]] and [[WesternAnimation/TheTransformers Optimus Prime's left leg]]. He proceeds to go on a rampage and chase after the titular heroes.
* Toward the end of ''Film/ConanTheBarbarian1982'', the villain Thulsa Doom (played by James Earl Jones) turns into a snake to emphasize his inhumanity, though Conan doesn't actually fight him in that form.
* In ''Film/DemonKnight'', we do briefly to get to see The Collector's true form [[spoiler:just before he dies]]: a gigantic, skeletal being with a ram's head and enormous wings. [[spoiler:[[MadeOfExplodium He blows up real good]].]]
* ''Film/TheDevilsAdvocate'': [[spoiler: Milton, after Kevin shoots himself, explodes and briefly turns into a demon, unleashing a curse that turns Christabella into a husk, and then turns into his old angelic form]].
* An almost literal example in ''Film/EndOfDays''. After Satan's human host is damaged beyond repair he abandons it and manifests in his true form as a gigantic, winged demon/dragon [[spoiler:before possessing the hero]].
* In a ProtagonistJourneyToVillain example, the finale of ''Film/TheFly1986'' has HalfHumanHybrid Seth Brundle's final transformation from a man who looks diseased but recognisably human into a horribly mutated insectoid beast, which not coincidentally happens just after his decayed human jaw is accidentally ripped away by his desperate lover as [[spoiler: he's preparing to forcibly merge himself with her and their unborn child via the telepods]]. Taking away his ability to speak, [[SplitPersonalityTakeover the last tether he has to what remains of his human reason and compassion]], means "Brundlefly" is solely driven by survival instinct and rage. [[https://www.youtube.com/watch?v=NH-8L1iZq20 Here it is]]. [[{{Squick}} Hope you have a strong stomach.]] [[spoiler: Luckily for the other characters, that makes him vulnerable to Revenge Before Reason and he ends up a Clipped-Wing Angel...but ''nobody's'' celebrating that.]]
** The [[Film/TheFlyII sequel]] has his son Martin undergo a similar transformation, but unlike his father's agonizingly SlowTransformation most of it happens inside a cocoon to avoid BodyHorror. Also unlike his father, he still retains most of his humanity, even if he can no longer speak...which does nothing to save his oppressors from his RoaringRampageOfRevenge!
* In the vampire film ''Film/FrightNight1985'' the vampires have three phases of transformation, the first is typically like a normal human, the second is like a normal human but with fangs, and the third phase is a [[DemonHead extremely crazy looking monstrous creature]] with MoreTeethThanTheOsmondFamily. At the end Jerry Dandridge (the main vampire) turns into a human/bat hybrid thing, gets hit by sunlight and bursts into flames and finally dies. Interestingly enough, the vampiric version of Amy is in fact a recycled version of the rejected librarian ghost from ''Ghostbusters''.
* ''Film/FrightNight2NewBlood'': While fighting Peter Vincent in the climax, Gerri just drops all pretense and transforms into some sort of baldheaded bat-monster.
* ''Film/{{Ghostbusters 1984}}'' has the scene at the beginning where the librarian ghost turns into a hideous ghoul when the [=GBs=] are trying to get her. Interestingly enough, there was an earlier librarian ghost puppet that got rejected because it was too scary, but it was recycled and used in the 1985 vampire film ''Fright Night'' (see below).
** Parodied at the end when Gozer, who initially appeared as a young woman, demands the Ghostbusters choose the form it will use to destroy them. All the [=GBs=] clear their minds except Ray - who unintentionally thinks of the Stay-Puft Marshmallow Man. Cue the [[AttackOfThe50FootWhatever attack of a 50-foot mascot]].
*** And technically, this also happens to Zuul and Vinz Clortho, where, after they complete the mating ritual and get zapped by Gozer's lightning, they burst out of their human disguises and resume their natural Terror Dog forms, only to not do anything more for the rest of the film until they are ultimately destroyed and turned back into stone statues by the destruction of the gateway to Gozer's dimension.
** In ''Film/{{Ghostbusters 2016}}'', the ghost-obsessed Rowan North commits suicide and comes back from the dead. Like Gozer, he asks for a form to cause the Apocalypse and transforms into a demonic and gigantic version of the Ghostbusters' logo mascot.
* Some of the monsters in the ''Franchise/{{Godzilla}}'' series can change form. For example, in ''Film/GodzillaFinalWars'', Monster X transforms from a skeletal dragon into the more powerful Keizer Ghidorah (Which is essentially an {{Expy}} of both King Ghidorah and [[Film/RebirthOfMothra Desghidorah]] (a quadrupedal three-headed dragon Kaiju)).
** Likewise, there's [[Film/GodzillaVsDestoroyah Destoroyah]] who changes from a pretty dang big crab/scorpion-esque monster into what looks like a kaiju version of TheDevil that towers over Godzilla himself.
** And there's Biollante, who takes this trope and makes it her own.
* The main villain in the 1980s Eddie Murphy Vehicle ''Film/TheGoldenChild'' spends most of the film looking like actor Creator/CharlesDance. At the Final Battle, and with no foreshadowing anywhere in the film, he transforms into a large, bony, winged demon (stop-motion animated to boot), whereupon Murphy kills him with a special knife.
* ''Guyver''
** At the end of ''Film/TheGuyver'', [[BigBad Fulton Balcus]], the head Zoanoid, turns into a giant creature after the main character refuses his invitation to join Chronos. The transformation is shown in the dark. All you can see are his GlowingEyesOfDoom, as they raise and separate to show just how [[BiggerIsBetter big he has become]]. To his credit, taking him down requires the Guyver to use his secret weapon -- a WaveMotionGun in his chest.
** In the sequel ''Film/GuyverDarkHero'', Crane, a reptile zoanoid and main antagonist, gets his own (though damaged) guyver unit and turns into bad-ass incarnate.
* In ''Film/Hellboy2004'', every time Rasputin dies, a little bit more of his god comes with him, until at the end of the film, he dies one last time, his body splits open, and a full-fledged EldritchAbomination emerges.
* In the climax of ''Film/{{Hop}}'', holding the egg of destiny transforms Carlos into a giant, freakish bunny/chick amalgamation.
* Happens to the villains in both 2003's ''Film/{{Hulk}}'' and 2008's ''Film/{{The Incredible Hulk|2008}}''. Then again, this makes sense as The Hulk himself could qualify as the heroic version.
* At the end of the stop motion film, ''Jack the Giant Killer'', after several attempts to kill Jack (the main character) are foiled, Pendragon, the main villain and evil sorcerer, transforms into a dragon to fight Jack, who eventually kills him in the final battle.
* In ''Film/KamenRiderXSuperSentaiSuperHeroTaisen'', [[Series/KamenRiderDecade Daiki Kaito]] uses the plates of [=DaiZangyack=] and [=DaiShocker=] to turn their respective battleships into the massive monstrosity Big Machine, a threat so powerful, it requires the [[Series/TokumeiSentaiGobusters Go-Buster-Oh]] and [[Series/KamenRiderFourze the Super-1 and Super-3 Switches]] in tandem.
* The martial arts comedy, ''Kung Fu Wonder Child'', ends with the EvilSorceror BigBad using his ''chi'' to transform into a gigantic ''[[RogerRabbitEffect cartoon]]'' Chinese dragon to assault the heroes.
* In the film version of ''Film/TheLeagueOfExtraordinaryGentlemen'', TheDragon consumes enough of Jekyll's serum to tower over the real Mr. Hyde.
-->'''Mr Hyde:''' Not the whole thing!
* In ''Film/{{Lisztomania}}'', Richard Wagner turns into a grotesque vampire at the final showdown with Franz Liszt.
* ''Film/TheLordOfTheRings'':
** An early idea for the grand finale in ''[[Film/TheLordOfTheRingsTheReturnOfTheKing The Return of the King]]'' was to [[DidYouJustPunchOutCthulhu show Aragorn fighting Sauron]] in the final battle. Sauron (just a [[FacelessEye gigantic red eye]] up to this point) would first be seen as a [[http://middle-earthencyclopedia.weebly.com/uploads/3/8/2/9/3829140/7742261.jpg?315 tempting angelic bishonen]] (Kate Winslet in cameo) who then transform into the gigantic armored fighter seen in the first movie's prologue. The filmmakers eventually decided that this was silly (and an inconsistency, since they had decided that Sauron wasn't supposed to be powerful and capable of fighting without his ring) and replaced the armored Sauron with a troll.
** There was a [[https://s-media-cache-ak0.pinimg.com/736x/23/19/1b/23191b17689310987547ceed1e1bea50.jpg captivating piece of concept art]] for the "[[BishonenLine pretty-boy]]" Sauron: an angelic albino possessing an otherwordly beauty...[[RedRightHand except for his eyes, fiery red-on-black, exactly like the flaming eye of his other form]]. [[GlamourFailure Furthermore, a close look at his face reveals that the flesh around his eyes has subtly began to crack like plaster...]]
** This is because Sauron is a Maia (angel), sort of like Gandalf. The beautiful side was his original form and he used it to corrupt Aragorn's ancestors. Eru Ilúvatar destroyed Númenor and Sauron lost his body. He recovered, but could never regain his beautiful form and had come up with a badass one instead. Thus the above scenario would have violated canon, but that probably wouldn't have bothered the film makers since they had already swapped Sauron's physical book-form for a giant red eyeball.
** A heroic example in both ''Film/TheLordOfTheRings'' and ''Film/TheHobbit'' trilogies is the beautiful, elegant, and queenly [[BigGood Galadriel]] entering her 'wraith' form in both ''[[Film/TheLordOfTheRingsTheFellowshipOfTheRing The Fellowship of the Ring]]'' (when she is tempted by the One Ring) and ''[[Film/TheHobbitTheBattleOfTheFiveArmies Battle of the Five Armies]]'' (when she banishes Sauron to Mordor). She becomes a green and scary looking, almost demonic version of herself and seems to increase in height and stature, [[VoiceOfTheLegion her voice lowering several octaves and reverberating with power]]. According to the WordOfGod, this is taken from Tolkien describing mighty Elf Lords entering such 'wraith' forms when experiencing extreme emotion such as anger or fear, and is an effective way of showing how powerful Galadriel is.
* Appears [[DiabolusExNihilo out of freakin' nowhere]] in the ''Film/LostInSpace'' [[TheMovie movie]]. [[spoiler:Dr. Smith]] is attacked by an alien bug and somehow this transforms him into a [[SpecialEffectsFailure distracting CGI creature]]. Bonus points for LampshadeHanging the "well, we couldn't kill you as a human but [[WhatMeasureIsANonhuman now that you're a monster you're fair game]]" issue!
* In ''Film/TheLuckOfTheIrish'', when Seamus starts losing to Kyle at basketball, he turns into his far darrig form (making him look a bit like ''Film/TeenWolf'') and his voice turns into a [[EvilSoundsDeep deep growl]]. Then again, only Kyle, his friends, and family appear to notice this.
* Happens to Maleficent in ''Film/{{Maleficent}}'', naturally. [[spoiler:[[NotHisSled Though it's actually the return of her wings]], ''[[NotHisSled not]]'' [[NotHisSled her transformation into a dragon]]]].
** Also happens to the shape-shifting [[TheDragon Diaval]], [[spoiler:who ''does'' become a literal dragon]].
* In ''Film/ManOfSteel'', Zod starts out like his fellow soldiers jumping around at high heights and having SuperStrength and speed. But when he breaks out of his battle suit during the final battle, he becomes as equally powerful as Superman, with the ability to fly and use heat vision.
* Happens '''all the damn time''' in ''Film/MenInBlack'' (both the [[Comicbook/MenInBlack comic]], movies, and [[WesternAnimation/MenInBlackTheSeries Animated]] [[AnimatedAdaptation Adaptation]]) whenever the disguised alien villains expose themselves in front of J and/or K. One has to wonder why they don't [[WhyDontYaJustShootHim just shoot]] before the transformation is complete, what with the guns usually loaded and pointed at the alien during the transformation.
** However, they may be following the grand tradition of movie aliens flipping out and assuming monstrous forms to attack. ''Film/TheThing1982'' does it (quite a lot really). So does Sil in ''Film/{{Species}}''.
** For the first film, it was justified since [[spoiler:the Bug had eaten the galaxy and shooting him would probably have destroyed it.]] Subverted in the third film - [[spoiler: after Boris kills J's father, he starts transforming and sneers "Go ahead, arrest me," at young-K. K calmly replies "Not today" and disintegrates him with one shot.]]
* Inverted in all three entries of ''Film/TheMummyTrilogy'', in which both Imhotep and the Dragon Emperor undergo some terrifying transformations ''before'' the climax, yet end up facing down the heroes in human form at the end. In the first film, a timely incantation renders the villain an ordinary mortal again; in the second, it's because Anubis wanted it that way; and in the third, it's because the hero dares the Emperor to fight like a man for honor's sake.
* ''Film/{{Nope}}'' has [[spoiler:the BigBad Jean Jacket. It spends most of the film as a FlyingSaucer, but that's just a compacted version of its true form. Said form is unveiled in the climax as a ''massive'' [[StarfishAliens Starfish Alien]] that resembles a bizarre white jellyfish with an expanding green eye.]]
* At the end of ''[[Film/TheOmegaCode Megiddo: The Omega Code 2]]'', Stone finally turns into TheDevil, a monster with wings, horns, and a tail.
* In the climax of ''Film/OnceUponAWarrior'', Irendri the Snake Sorceress proves she lives up to her name by revealing her most powerful form, a snake-human hybrid, whose body have numerous extra snakes extending from her limbs, shoulders, and various parts. It's her most powerful form and she absolutely delivers a thrashing on the hero Yodha, who is hopelessly overpowered by the sorceress.
* ''Film/ResidentEvilExtinction'' has the big bad evil scientist injecting himself with a massive dose of secret formula and then mayhem ensues. So does ''Anime/ResidentEvilDegeneration'' [[spoiler:Except that in ''Degeneration'', he was more of a WellIntentionedExtremist, who's plan was to go on a rampage, exposing the research on the G-virus that was being done.]]
* In ''Film/ReturnToOz'', once Dorothy begins guessing right at the ornaments and restoring the Scarecrow, Tik Tok, and Jack to their original forms, the Nome King -- previously human-sized and at one point almost looking entirely human thanks to everyone else being imprisoned -- becomes a giant rock monster and attempts to eat them all. Unfortunately for him, [[spoiler: Billina is still inside Jack's head and lays an egg, which falls into the King's mouth...POISON... TO... NOMES!!!]]
* The true form of the renegade spirits in ''Film/{{RIPD}}''.
* In the 2002 live action ''Film/ScoobyDoo'' movie, Scrappy[[FaceHeelTurn (!)]] turns into a demonic version of himself with razor sharp claws and teeth, a big muscular body, wild looking eyebrows, enhanced agility and strength- A DEEP BOOMING VOICE [[ArsonMurderAndJaywalking and a horrid case of bad breath]]. TakeThatScrappy, much?
* In ''Film/SuicideSquad2016'' Diablo somehow turns into a twelve-foot tall Aztec skeleton wreathed in flames during the fight with Incubus, making him just strong enough to [[spoiler: force him into the corner with the bomb]].
* Shredder, at the end of ''Film/TeenageMutantNinjaTurtlesIITheSecretOfTheOoze'', drinks the mutagen, which transforms him into Super Shredder ([[BodyHorror also transforming his outfit]]). He attempts to [[KarmicDeath destroy the Turtles along with himself]] by bringing the pier down on their heads.
** ''Anime/TeenageMutantNinjaTurtlesLegendOfTheSupermutants'' cartoon that only aired in Japan (and has gained a bit of notoriety online as many viewers assume that it must be an [[StealthParody elaborate parody]]). In this series, the Turtles were granted magical crystals that allowed them to transform into superpowered forms. Sadly, Shredder, Rocksteady, and Beebop found evil versions of the same crystals and are now capable of turning into superpowered monsters. At this point, it's probably better just to direct your attention to [[https://www.youtube.com/watch?v=MQAQohS0On4 the show's opening sequence.]]
* In ''Film/TenaciousDInThePickOfDestiny'' Paul F. Tompkins changes into Satan and KG and Jables challenge him to a [[ThePowerOfRock rock-off]].
* Creator/TimBurton has used this trope a few times:
** In ''Film/{{Beetlejuice}}'' the titular character turns into a variety of bizarre things to frighten people, as do Adam and Barbara.
** Parodied in ''Film/BigFish''. The hero suspects the ringmaster is a werewolf and dreads the inevitable transformation. Turns out he ''is'' -- but [[OurWerewolvesAreDifferent not a mean or monstrous one]]. The werewolf does bite Edward, but then he apologizes after he turns back into a human.
** As mentioned in the [[OneWingedAngel/WesternAnimation Western Animation section]], Characters/BatmanTheJoker loved revealing his MonsterClown face. This is due to a scene in the 1989 ''Film/{{Batman|1989}}'' film where Viki Vale (Kim Basinger) sprays water on The Joker's (Creator/JackNicholson) face revealing his MonsterClown look under the makeup and The Joker quotes the witch from ''Film/TheWizardOfOz''.
** The Penguin in ''Film/BatmanReturns'' is another non-fantastic example. As a derelict living in the sewers, he wears nothing but a thick robe over slime-stained long underwear. Once he decides to compete in Gotham City's mayoral race, he begins appearing in public in a tuxedo shirt, a waistcoat, striped pants, a bow tie, and a top hat. Fleeing the city in disgrace after [[EngineeredPublicConfession his hypocrisy is exposed by Batman]], Penguin loses his hat and retreats back into the sewers, where he begins stripping off his fancy suit. For the rest of the movie, he appears only in his robe-and-long-underwear combo - signaling that he has returned to his "normal," quasi-animalistic self.
** Although it's debatable if the Hessian counts as a villain...the Hessian Horseman's head growing back at the end of ''Film/SleepyHollow1999'' could also qualify.
* ''Franchise/UltraSeries''
** During the final battle of ''Film/MegaMonsterBattleUltraGalaxyLegends'', Franchise/UltramanZero manages to defeat Ultraman Belial by throwing him into a pit of lava. He's soon followed by the souls of his 100 {{kaiju}}, merging with them to form the 100 Union Kaiju Beryudora. It takes an all out attack from the Ultras, EX Gomora, and Ultraman Zero to finally put him down. [[spoiler:And Belial ''still'' survived!]]
** In the sequel ''Film/UltramanZeroTheRevengeOfBelial'', Belial absorbs a massive amount of energy crystals he was stealing, transforming into the gigantic and monstrous Arch Belial.
** In ''Series/UltramanTiga: The Final Odyssey'', the Dark Giant Camila uses ThePowerOfHate to call forth the residual darkness of [[EldritchAbomination Gatanozoa]] left over from the SeriesFinale, merging herself with it to transform into Demonozoa, an utterly colossal version of Gatanozoa made entirely of shadows.
* Dracula and his brides in ''Film/VanHelsing'' can turn into harpy-esque bat things. And in the finale, [[spoiler:Van Helsing himself]] becomes a werewolf to battle Dracula, who has turned into a giant demon thing.
* In ''Film/WarCraft2016'', when Lothar and Khadgar confront [[spoiler:Medivh]] and beat his minion, he hulks out into a giant demonic figure.
* Judge Doom in ''Film/WhoFramedRogerRabbit'' is almost a sick parody of the "Look at my true form and despair" variation.
-->'''Eddie Valiant''': Holy smoke, he's a Toon!\\
'''Doom:''' Surprised?\\
'''Eddie:''' Not really. That lame-brain freeway idea could only be cooked up by a Toon.\\
'''Doom:''' Not just ANY Toon... ''(reveals his true identity)'' Remember me, Eddie?! When I killed your brother, I talked! [[PunctuatedForEmphasis JUST! LIKE!!]] ''[[PunctuatedForEmphasis THIIIIISSS!!!!!]]''
* In ''Film/{{Windigo}}'', [[Franchise/TheSlenderManMythos Slender Man]] is seen primarily as a BadassInANiceSuit... until the climax where he unleashes his CombatTentacles and starts throwing around vehicles.
* In ''Film/{{Wishmaster}}'', the Djinn adopts his true djinn form whenever things get serious. He also appears like this when he gets defeated in the climax of every one of the movies, demonstrating that it's a true monster being overcome by the protagonists.
-->'''Djinn:''' Spare me, child. Behold my true face.
-->'''Alexandra:''' Oh my god.
-->'''Djinn:''' [[SssssnakeTalk Yesss]]. The shit just "hit the fan", didn't it?
* ''Film/TheWitchesOfEastwick'' has the scene where Jack Nicholson's character becomes a giant and then after the girls smash the wax voodoo doll of him becomes a worm-like monster.
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