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One of the basic building blocks of story telling is a character's inner struggle, their efforts to balance their base urges and lofty ideals. This is not conducive to [[StuffBlowingUp high octane explosions]] and [[FightScene fist fights]], nor is it easily transmitted in television even by serious series. However, toss in [[DemonicPossession demons]], MindControl, and a JourneyToTheCenterOfTheMind, and you'll get a Battle In The Center Of The Mind.

What ends up happening is you get the mental equivalent of a no-holds-barred psychic showdown between the evil force trying to take over and the owner or his allies. The evil force can be of various natures, including: {{Demon|icPossession}}s, [[OurGhostsAreDifferent Ghosts]], an [[AIIsACrapshoot evil computer virus]], other humans via MindControl or the self with an EnemyWithin or SuperPoweredEvilSide. What the possessing force wants is either a full SplitPersonalityTakeover, or (if external) to maintain control.

Opposing this force is usually the "host" or person that is being affected. Occasionally, their mind is too weak and addled to oppose the invader, so a friendly telepath or mystic will insert an ally or two to try and rout the bad guy. They will fail. However, the act of them trying and yelling ''"[[IKnowYoureInThereSomewhereFight I know you are in there somewhere!]]"'' and going in to save them from the evil presence in their mind is usually enough to get the host to kick their unwanted guest out of their mind if not completely obliterate it when it [[HeroicResolve threatens their friends]]. The thing is, no matter how powerful the invader, it can't beat a determined victim's home brain advantage.

The fight itself will usually use highly symbolic weapons (a chef's ladle now doubles as a {{BFS}}), [[PsychicBlockDefense defenses]] (a security blanket can now [[DeflectorShields block]] KiAttacks) and even imaginary allies (summoning up an army of {{Superm|an}}en to help you out), turning into something similar to a ShapeShifterShowdown.

For those on the outside, it's usually obvious that the character is FightingFromTheInside.

----
!!Examples:

[[foldercontrol]]

[[folder:Anime & Manga]]
* ''Anime/BlackRockShooter'' has the titular "otherselves" as apparently "censor" mechanisms that remove pain and frustration from their human selves. The problem is that the effect "bleeds" out and the titular Black Rock Shooter is removing what she considers to be pain and suffering in other people's heads. The finale is Mato; Black Rock Shooter's human self; taking control of her Black Rock Shooter function, splitting from, and then beating down her KnightTemplar tendencies which takes the form of Insane Black Rock Shooter.
* In ''Manga/TheWorldGodOnlyKnows'', Keima Katsuragi has some of the most extreme (and funny) wars in his head over various video game related subjects. One involved a enormous space war complete with ''MobileSuitGundam'' and ''Franchise/StarWars'' references, fought by armies of himself. Though it's probably his imagination.
* ''[[PrettySammy Magical Project S]]''
* ''Manga/{{Bleach}}'':
** Ichigo vs. Hollow Ichigo. In the anime it's fleshed out a bit more, making him re-experience his fights with Kenpachi, Byakuya and Jin Kariya before fighting [[FanNickname Hichigo]].
** Later, Ichigo has one with [[spoiler:[[EmpathicWeapon Tensa Zangetsu]]]].
*** It eventually turns into [[spoiler:Ichigo vs. the combined form of Tensa Zangetsu and [[FanNickname Shirosaki]].]]
* ''Manga/MahouSenseiNegima'' has Negi fighting Evangeline (or at least a being created from his memories of her) inside his own head as part of his test for learning BlackMagic.
* Done backwards in ''MartianSuccessorNadesico'' when Akito engages in a virtual battle with the ship's computer to delete its memories. In this case deleting the computer's memories was the heroic thing to do, but the computer wasn't aware of this and fought to protect itself. Both Akito and the computer chose to virtually represent themselves as Gekigangar III, the titular giant robot from ''Nadesico's'' ShowWithinAShow, combining this trope with FearfulSymmetry.
* Crops up in ''Anime/ParanoiaAgent''; Or is it a LotusEaterMachine?
* Happens between brother and sister Masamune and Tsubaki Nakatsukasa in ''SoulEater''. The conflict between the two souls (Masamune being able to possess Tsubaki, which she allowed in order to confront him) is shown as a physical battle between the two, each using their own weapon forms. Souls get Mental Worlds elsewhere in the series, but this is the only actual battle so far. Curiously, Black Star's attempt at mastering the form possessed (and corrupted) by Masamune ultimately involved not a similar fight but a conversation.
* In ''DragonballZ'', Goku and Vegeta fight projections of Piccolo, Gohan, and Gotenks in Super Buu's brain.
* ''Manga/{{Naruto}}'':
** Chapter 493 has [[spoiler:Naruto vs. the embodiment of his hatred at the Waterfall of Truth]]. The scenery doesn't change, however, indicating that it's more of a hallucination than going to the center of his mind.
** Shortly after that, [[spoiler:Naruto fights the Kyuubi (Nine-Tails) within his mind. Yes '''that''' Kyuubi. The one that he has had no control over and been terrified of most of the series]].
** [[spoiler:It also turns out to be a subversion. It may have been a battle in Naruto's mind, but that didn't make it any ''less'' real. Naruto using named attacks instead of unnamed also lends credence that he could do almost anything he did in the battle in the real world.]]
* At one point in the ''{{Berserk}}'' manga's Millennium Falcon arc, [[spoiler:Schierke has to go inside Guts's mind using AstralProjection to snap him out of the influence of his [[EnemyWithin inner beast]] the first time he uses the Berserker Armor]].
* The Manga adaptation of ''VideoGame/BreathOfFireIV'' has [[TheHero Ryu]] and [[WoobieDestroyerOfWorlds Fou-Lu]] [[SplitPersonalityMerge merge]] into [[PhysicalGod Infini]] and then mentally duke it out for control of the creature. This is a ThirdOptionAdaptation from the game, where Ryu either resists the merge and fights Fou-Lu's Tryant dragon with his allies, or he accepts the merge and Fou-Lu takes control of Infini, [[CurbStompBattle easily wipes out Ryu's friends]], and proceeds to destroy the world.
* In ''WeissKreuz Gluhen'', Berger draws Crawford into his own psychic mindscape to fight him. Crawford, however, manages to turn it around on Berger and pull both of them into the center of ''his'' own mind - and unlike in Berger's, in Crawford's mind, they aren't alone.
* Ranmaru from ''{{Tokko}}'' has to do this after an encounter with [[BigBad Taishi]] results in him losing control of his [[SuperpoweredEvilSide phantom]].
* ''PuellaMagiMadokaMagicaTheMovieRebellion'' has the cast fight [[spoiler: inside Homura's soulgem, to stop her transformation into a witch.]]
[[/folder]]

[[folder:Comic Books]]
* Comicbook/IncredibleHulk: During Paul Jenkins' run, one of Bruce Banner's Hulk personalities, the 'Beast', a near-mindless monster, threatens to take over completely, so Bruce journeys into his mind and recruits the three main Hulks - Savage Hulk, Joe Fixit, and the Professor - to defeat it on his/their home turf.
* ''Comicbook/StarWarsLegacy'' features a power struggle of two Sith Lords in each other minds. Lightsaber fights are blank compared to what they can achieve in that state.
* In ''Comicbook/{{X-Men}}'', the only way to save a person infected by the Brood is to kill the parasite's mind; unless you are a very good telepath you won't be able to save yourself. HeroicResolve won't solve the matter--it is necessary for the help to be able to arrive in time in the first place. (Or, you need to be Wolverine. Or Rogue with Wolverine nearby.)
* Comicbook/TheAvengers played with this one in the 2001 annual, involving Hank Pym's separate personalities (Goliath, the cold unfeeling reason, and Yellowjacket, the impulsive showoff) who hated each other's guts getting dumped into a psychic landscape that was supposed to represent the original's mind after they were physically separated into two people in the real world. Initially, they started fighting for control, even trying to force Janet (who was back together with him at the time) to choose which one would live. Only after they both accepted the previously ignored third aspect (the human combination of both) were they put back together, keeping him from dying.
* The final battle of ''ScottPilgrim'' is like this. [[spoiler:A part of Ramona still wants to be with Gideon. [[BigDamnHeroes All the other parts want to beat the crap out of him, though]].]]
* The Reboot version of the ''ComicBook/{{Legion of Super-Heroes}}'' had a memorable one, when [[PsychicPowers Saturn Girl]] enters [[IncredibleShrinkingMan Shrinking Violet's]] mind to help her free herself of the control of the cursed Emerald Eye of Ekron, which is using her body to attack the rest of the team.
* In a 2002 comic book, Donald has to fight the Beagle Boys in [[http://www.cracked.com/article_19021_5-amazing-things-invented-by-donald-duck-seriously.html Uncle Scrooge's dreams]] before the Boys find out the combination to Scrooge's vault.
* Issue 8 of ComicBook/FlashGordonZeitgeist [[http://scans-daily.dreamwidth.org/4208369.html has this]] with Hans Zarkov.
* {{X-23}} is drawn into one in ''The Killing Dream''. A demon attempting to recruit Laura to his service tells her that as a clone she has no soul. When she refuses and denies this accusation he fatally wounds [[spoiler: Julian]] to force her hand, offering to spare [[spoiler: him]] if she accepts a place as leader of his armies. Laura once again denies him, so the demon [[TakeAThirdOption offers her another option]]: Prove him wrong. When she agrees to this the demon drags her into a hellish landscape within her own mind, presenting her with images of all the death she has caused and will yet cause to break her will. However Laura encounters her inner self, who reveals that she wasn't ''born'' an emotionless killing machine but that it took the conscious effort of the Facility to break her. [[spoiler: This revelation, and the memory she is shown of defying her orders to spare the young son of Martin Sutter (actually the son of one of her creators, Zander Rice, through an affair with Sutter's wife) when sent to kill the entire Sutter family, shows Laura she ''is'' more than just a weapon and gives her the power to escape the demon's influence, saving both herself and Julian.]]
* Issue #9 of ''ComicBook/SuperiorSpiderMan'' features a showdown between Otto Octavius and Peter Parker, [[spoiler:who, after his death in Ock's body in ASM #700, exists as a 'ghost' in his own body via all his memories given consciousness]]. Otto begins to [[spoiler:purge Peter's memories through one of his devices in order to get rid of him, but Peter fights back, forcing Otto to go in and eliminate Peter himself. In the Mindscape, Peter summons the memories of his friends and family to subdue Otto. But, Octavius, having looked back at Peter's memories for months, summons the memories of all his enemies, who "kill" Pete's friends, which erases his memories of them. Peter is horrified by his loss, but regains confidence and turns in the Amazing Spider-Man, and Otto follows by turning into the Superior Spider-Man. Both fight and look at the reasons why the other one fails at being Spider-Man; Peter discusses Otto's brutality, and Otto discusses Peter's {{Thou Shalt Not Kill}} rule and the indirect problems it caused. Otto wins by pointing out Peter's {{Moment of Weakness}} - risking the life of a girl while Otto was performing brain surgery on her, so that Otto wouldn't get the tech to find Peter in Otto's brain. Peter is defeated and ashamed of himself. Otto declares that he is superior to Spidey and manages to successfully erase Peter from his brain.]]
[[/folder]]

[[folder:Fanfiction]]
* Multiple battles occur in the Death Note fanfic [[http://www.fanfiction.net/s/9644493/1/Zenith-Darkness-Reverie "Zenith, Darkness, Reverie]]", as the protagonist and [[spoiler: Kira]] attempt to determine which personality should be granted control of the body, the Death Note, and, by extension, [[FridgeHorror the world]].
* An interesting version occurs in [[http://www.fimfiction.net/story/119688/1/you-obey/the-interrogation You Obey, ]]where it is the protagonist who initiates the battle.
* A big part of the fight with [[spoiler:Future Cell]] in ''FanFic/HonorTrip''. [[DragonBallZ Cell]] tries everything in his power, including TalkingTheMonsterToDeath, and [[CrowningMomentOfFunny harassing his captor]] [[ItMakesSenseInContext by beat-boxing a taunt]].
* [[http://gekizetsu.net/sn/fic.html Gekizetsu's]] series ''The Month of Open Doors'' begins with ''Series/{{Supernatural}}''[='=]s Dean Winchester locked in a room in his own mind by ''something''. A rather strange battle in the centre of the mind plays out over the first arc, ''As Fools Shine On''.
* The ''Webcomic/{{Homestuck}}'' fanfic [[http://archiveofourown.org/works/88640/chapters/120134 Darkness]] climaxes in John, who has gone utterly insane, [[spoiler: fighting an EvilTwin.]] On the outside, of course, he's gone into a coma.
* Because MindRape was a staple of ''[[WesternAnimation/AdventuresOfTheGalaxyRangers Galaxy Rangers]]'', the {{Fanfic}} tends to break out this one quite often. Red Witch's [[http://www.fanfiction.net/s/4076944/1/Down_the_Dark_Path Down the Dark Path]] plays it straight after Shane was tortured with the Mindnet. [[http://www.fanfiction.net/s/1195951/1/Isnt_Life_Strange "Isn't Life Strange"]] and [[http://www.fanfiction.net/s/348456/1/Chrysalis_Trial_by_Fire "Chrysalis"]] use it as well. Subverted in those fics as the Rangers affected lose - ''badly.'' [[spoiler: It's played straight in both later, though.]]
* Used in the Roleplay/DCNation universe after Raven's attempt to restore some of Troia's lost memories end up getting Raven, Troia, Nightwing, Flash, and Arsenal [[http://community.livejournal.com/jla_watchtower/923182.html in a brawl with Dark Angel]]. Leads to one of Arsenal's [[CrowningMomentOfAwesome best lines]]:
--> '''Arsenal:''' ''"All you're telling me is that I've pissed in your Cheerios more than once, and I did it beside Donna. Lemme tell you, those are two things that make me a very happy little camper...And hey, extra bonus for me at the end of it? I pissed you off when I didn't even mean to! Little ol' me. [[BadassNormal A guy. A dude. A very attractive but semi-normal human fleshbag.]] Man, I'm good."''
* In the {{Daria}}[=/=]WesternAnimation/LegionOfSuperHeroes FanFic crossover ''Legion of Lawndale Heroes'', psi-active cadets at the MilitarySchool known as the ''United States Academy of Extranormal Studies'', or '' 'USAES' '', can receive certification in the ''Astral Special Tactical Response Operations (ASTRO)'' course for out-of-body and psionic combat. As part of their training, cadets learn how to create a specific 'mental persona' (much like [[Literature/HarryPotter a 'Patronus']]) to do mental combat in and manifest their powers during that combat.
* Tropers/TakerFoxx's ''FanFic/ImperfectMetamorphosis'' has so far in the story four characters sharing a same body because [[spoiler:[[BlobMonster the jelly monster]] can absorb other characters]]. It doesn't help that one of them came with a SuperPoweredEvilSide. There is a BattleInTheCenterOfTheMind between [[spoiler:the host]] and the villain when the villain is discovered.
* Implied in [[http://www.youtube.com/watch?v=7eSSZZFSs8U this fanvid]] for ''Film/TronLegacy'' (spoilers out the kazoo).
* The [[GuileHero dwarven]] [[WisePrince noble]] [[MagicKnight protagonist]] of ''DragonAgeTheCrownOfThorns'' had more than one of these, twice against actual psychic attacks by the Archdemon. The latest one had rather severe consequences for both the prince and the whole world because the Old God actually [[spoiler:evolved because of contact with the exile's MagnificentBastard-level intelligence.]]
** Kallian Tabris also goes through something like this at one point, only [[spoiler:it's a projection of her soul, taking Faren's form (the dwarven commoner, her love interest), that does the actual fighting]].
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' fanwork ''[[Fanfic/ThePartyNeverEnded The Party Never (or Hasn't) Ended]]'' features Twilight Sparkle having to help Pinkie Pie in one of these against Nightmare. Then Pinkie Pie helping Rainbow Dash. [[spoiler:[[{{Determinator}} Then Pinkie Pie by herself. And it is awesome.]]]]
* ''FanFic/QueenOfAllOni'': Throughout the story, we get [[GhostInTheMachine glimpses inside of]] [[VillainProtagonist Jade's]] mind, where we watch as Hero (the [[AnthropomorphicPersonification Aspect]] representing Jade's heroic nature) gather together as many uncorrupted Aspects as he can into a LaResistance aimed at regaining control of Jade's mind from [[SuperpoweredEvilSide The Queen]]. They eventually launch an attack on the ship representing Jade's consciousness, but before Hero and The Queen can fight each other, the trope ends up being subverted -- in the real world, Jade is captured by the EvilSorcerer Lung, whose attempts to break Jade to his will end up driving her insane, which cause the mindscape to literally fall apart, forcing the Aspects to focus on their own survival. [[spoiler: When Jade's mind is restored, The Queen captures Hero, ensuring her continued dominance of Jade's mind.]]
* Happens a couple of times in the ''FanFic/PonyPOVSeries'':
** First, during Pinkie Pie's reharmonizing chapter, Angry Pie (a SplitPersonality representing all of [[ExactlyWhatItSaysOnTheTin Pinkie's anger]]) attempts to pull a SplitPersonalityTakeover by absorbing all the other pieces of Pinkie's mind. Pinkie is only able to defeat Angry by [[spoiler: performing a SplitPersonalityMerge with her Pinkamina personality and then forcing the merge on Angry as well.]]
** This is also the conclusion of the Trixie storyline: [[spoiler:Twilight [[JourneyToTheCenterOfTheMind enters Trixie's mind]] to free her of her discording, and is confronted by Trixie's EnemyWithin, Loneliness, who fights her at every turn. Eventually, Twilight gets through to Trixie, who accepts her help, and together they destroy Loneliness.]]
** This also pops up at the end of Bright Eyes' entry of the ''7 Dreams/Nightmares'' collection: [[spoiler: she's dragged into her MentalWorld by an entity claiming to be her EnemyWithin Cruel Eyes, but is actually the Shadow of Discord's eldest brother [[UnPerson D___t]], who's trying to [[GrandTheftMe absorb her soul and potential concept]] in order to reconstitute himself. With the love of her friends and family, Bright Eyes is able to defeat D___t, [[GenreSavvy being sure]] to destroy his Shadow even after mortally wounding him in order to make sure he stays gone.]]
* Happens at the climax of ''FanFic/GettingBackOnYourHooves'': [[spoiler: After [[BigBad Checker Monarch]]'s EngineeredPublicConfession, she [[VillainousBreakdown snaps]] and casts a mind spell to trap Trixie and her friends in [[YourWorstNightmare their worst nightmares]] in order to break them. Thanks to a Lucid Dreaming trick Trixie [[ChekhovsGun taught them earlier]], the girls are all able to see the [[AGlitchInTheMatrix flaws in the dreams]] and take control of them, before forcing the [[MindHive pieces of Checker's consciousness]] attacking them out. Said pieces [[OneWingedAngel fuse together]] and try to destroy them, but they [[ClippedWingAngel easily defeat it]]. They then travel to Trixie's dream, where she's being attacked by the main part of Checker's mind, and give her the strength and encouragement she needs to fight back and finally defeat Checker.]]
* FanFic/AGrowingAffection has a battle between Naruto and the Kyubi [[spoiler: while Naruto is sedated by the Akatsuki and they are unraveling the seals on the demon. The weakening of the seals allow the Fox to create a clone/fragment that can slip through the cage and fight Naruto.]]
* ''Fanfic/VariantStrain'' has Peter doing this against [[spoiler: Hank.]]
* ''FanFic/TheWorldOfTheCreatures'' takes place in the mind of the [[SelfInsertFic author/protagonist]]. It acts as the setting for a MassiveMultiPlayerCrossover Fic where various characters from different franchises face off against an idea-eating monster.
* In ''FanFic/YugiohTheThousandYearDoor'', Diana has a small battle in the center of her soul to free herself from the Shadow Queen's Mind control.
* While [[JourneyToTheCenterOfTheMind journeying into Socrates' mind]] to repair a faulty transmitter chip in ''Fanfic/CalvinAndHobbesTheSeries'', the protagonists find it along with his dark side, who then fights Hobbes. It's a somewhat downplayed example, as the emphasis isn't on the battle but rather Calvin and Andy trying to repair the chip.
* In ''Fanfic/TheSwarmOfWar'', the Overmind has one against Ahzek Ahriman. Turns out even one of the most powerful psykers in the galaxy cannot match a world spanning HiveMind.
* In [[https://www.fanfiction.net/s/10610004/1/The-Mind-of-the-Doctor The Mind of the Doctor]] the Doctors battle against the Dark Side of them who has been freed by the War-Feeder.
[[/folder]]

[[folder:Films -- Live-Action]]
* In the film ''Literature/{{Dreamcatcher}}'', based on the Creator/StephenKing novel, one of the characters is possessed by an alien being. In his mind, he locks himself in a warehouse of his memories and tries to bar the alien presence from getting inside.
* ''Film/HarryPotterAndTheOrderOfThePhoenix'' makes good use of this in sequences throughout, especially at the end when Voldemort attempts to possess Harry. Voldemort imprints Harry with the memories of all the loved ones he has seen die by that point at Voldemort's hands, before Harry turns it back on him by noting that he truly pities him for his inability to feel love or the joy of friendship.
* In the psychedelic western ''Renegade'' (aka ''Blueberry''} based on the graphic novel, the hero takes peyote and gets into a spirit battle with the villain. The forces of good are [[ColorCodedForYourConvenience golden]] [[AnimalStereotypes reptiles]], while the evil side are [[ColorCodedForYourConvenience black]] [[AnimalStereotypes bugs]]. After defeating the villain, the hero watches a recreation of a [[TraumaInducedAmnesia forgotten tragedy]] and comes to terms with it.
* In the Chinese film ''Film/{{Hero}}'' Magistrate Nameless makes a show of attempting to arrest Long Sky at a Chess Court in his prefecture. They pause mid-fight, Nameless paying the resident (blind) [=GuQin=] master to continue playing. [[http://www.youtube.com/watch?v=ZUevedfnrmc This he does]], as they fight out the remainder of the battle in their minds. When he breaks his instrument with the sheer intensity of his playing, the fight plays out for real and Nameless defeats Sky in a matter of seconds.
* ''Film/{{Inception}}'' takes this trope and turns it UpToEleven. Virtually the entire plot takes place inside a dream, battling defensive figments called 'projections' while trying to plant the Idea in the subject's mind. [[spoiler:To make things worse, the specter of the protagonist's dead wife haunts his steps.]]
* ''Film/SherlockHolmesAGameOfShadows'' features an example similar to ''Hero'': [[spoiler:When Holmes and Moriarty have completed a game of chess and Holmes reveals the full extent of the damage he's done to Moriarty's ambitions, Moriarty walks up to him in full TranquilFury, pausing to give Holmes a last light on his pipe. As this happens, Holmes begins a SherlockScan to analyze the fight that's going to start in a moment and make his plan of attack, only for Moriarty to smile at him and continue the analysis; both play out the complete battle in their heads, and both foresee an inevitable NoHoldsBarredBeatdown that results in Moriarty beating Holmes to death and throwing him off the balcony. With no situation in which he can defeat Moriarty and both of them well aware of it, Holmes goes for the one thing Moriarty didn't predict in their mental battle; a TakingYouWithMe attack.]]
* In the Guy Ritchie film ''Film/{{Revolver}}'', the protagonist Jake Green, who is claustrophobic, battles his [[MindScrew ego]] when he gets trapped in an elevator. What follows is a scene that looks straight out of the last episode of ''Anime/NeonGenesisEvangelion''.
[[/folder]]

[[folder:Literature]]
* The [[AntiClimaxBoss stand off]] with the Volturi in ''[[Literature/{{Twilight}} Breaking Dawn]]'' can be interpreted as this, as Bella [[spoiler: used her vampiric ability to block out powers to protect Cullen allies from Jane's ability to telepathically cause pain to others.]]
* In Creator/TerryPratchett's ''Discworld/{{Thud}}!'', when Commander Vimes [[spoiler: is chosen as the Summoning Dark's champion, its attempts to take him over are represented as it entering a city (Vimes's mind) and being thrown out by a Watchman,]] representing the bit of Vimes that watches himself: [[spoiler: the Guarding Dark.]]
** This also shows up in ''Discworld/AHatFullOfSky'', where the Nac Mac Feegle help Tiffany confront the hiver that's taken over her body by luring it into the part of her mindscape where she's most powerful, a mental representation of her home country.
** Granny Weatherwax has a moment like this in ''Discworld/CarpeJugulum.'' (Vimes and Granny have a lot in common...)
** Rincewind has a Hissy Fit In The Center Of The Mind in ''Discworld/TheLightFantastic'', when he berates the Great Spells of the Octavo for ruining his life, and he later subdues the Eighth Spell by figuratively hauling it out of hiding within his psyche.
* In the {{Elric}} story ''TheBloodRedGame'', humans and their allies escape an imploding universe and want to settle in another. When they do, they encounter aliens. Said aliens would issue a CurbStompBattle in a physical fight, but they agree to play their "Blood Red Game" to allow humans to settle. Said game is a BattleInTheCenterOfTheMind. Losers become catatonic or insane.
* ''[[TheRiftwarCycle Magician]]''. Tomas, one of the main characters, finds a suit of cursed armor that fuses him with a godlike being, who wants to repulse the invaders (Tsuranii). Said godlike being was one of a race that created the bloody elves as their personal slaves, to the point that an elf can't disobey any word said in their language, and who are fiercely protective of their world. Now, if Tomas standing in the middle of a storm of pure mental fury from a dragonlord whilst quietly saying, "I am Tomas" isn't an incredibly badass version of this, nothing is.
** That "godlike being" is actually a Dragon Lord, or Valheru as the elves call them. They weren't really godlike, as they all got slaughtered except one[[note]]The one whose armor Tomas finds, Ashen-Shugar[[/note]] when they challenged the Lesser Gods of Midkemia[[note]]Midkemia has Lesser and Greater gods. The Lesser Gods were also fighting the Greater Gods during the Chaos Wars, and the Valheru barely made a dent in either side even with the ArtifactOfDoom Lifestone boosting their power.[[/note]] during the Chaos Wars, but they're still far more powerful than any human or elf except the highest levels of magician.
* The ally-assisted version was used in the book ''Prince of the Sidhe'', when King Aedh of Eiru (Ireland) gets drugged by the book's villain. We see Aedh's mindscape (which is just as confused as he is), and get things from his point of view when the titular character comes to Aedh's assistance in his own unique fashion.
* in the sixth YoungWizards book, the autistic wizard-to-be Darryl is subjected to this constantly - his "Ordeal" (a battle with the Lone Power to prove fitness as a wizard) has gone on for ''three months''. The reason for this is that [[spoiler:he's an abdal, a physical embodiment of God's power, and the Lone Power (Satan) fears the amount of power he'd have if he ''did'' make it as a wizard]]. Eventually Nita and Kit get into the kid's head to help him break the cycle.
* Creator/GeorgeRRMartin's "The Glass Flower" has pretty much turned this whole concept into a story. He calls it 'the game of mind'.
* In the ''TabletopGame/{{Warhammer 40000}}'' [[Characters/Warhammer40000ImperialGuard Imperial Guard]] novel ''Cadian Blood'', Seth [[spoiler:in a LastStand against a daemon. When the daemon kills him, he dies laughing and saying the look at the daemon's face made the fight worth it.]]
* [[spoiler:Lasciel]] was doing a pretty good job of screwing with [[Literature/TheDresdenFiles Harry Dresden]] until he realized that even [[spoiler:a fallen angel]] is at his mercy when it's in his head. [[CurbStompBattle Pwnage ensued.]]
** Also Harry vs. [[spoiler:Leonid Kravos]], slugging it out in Harry's dreamscape at the end of ''Grave Peril''.
** Molly fights an epic one against [[spoiler:the Corpsetaker]] in ''Ghost Story''. Apparently, the center of Molly's mind looks like the bridge of the [[Series/StarTrekTheOriginalSeries 1960s Enterprise]], complete with a crew of Mollies wearing miniskirt uniforms and mimicking the behavior of the original characters and an epic fighting music soundtrack.
*** Not to mention the ''miles'' of incomprehensibly intricate battlefield outside of the bridge. The fact that [[spoiler: Corpsetaker gave up attempting outmanouveres and just started smashing everything until she overpowered Molly says a lot about how good Molly is at this illusion stuff]].
** In the latest Dresden files novel ''Literature/ColdDays'', we see Harry get into several of these, including one with [[spoiler:Mab's boss]] which, if he lost, would mean his execution. And another when he battles against [[spoiler:Sharkface, an Outsider]].
* Julia spends most of ''Literature/TheRagwitch'' trying to find a way to make some headway FightingFromTheInside the titular monster. Towards the end, this culminates in a real battle when [[spoiler:she, Lyssa, and the personalities of the king and the original witch who was subsumed into the Ragwitch]] fight for continued existence after the Ragwitch finally realizes that Julia hasn't been as helpless as she thought. A dragon and hordes of {{mooks}} are involved.
* Dandra and Tetkashtai get one during the climactic battle of the second book in ''Literature/TheDragonBelow'' trilogy. Though it is less of an invader vs. invaded than two splinters of one personality duking it out to see which will be dominant.
* The ''Franchise/StarWarsExpandedUniverse'' DarthBane novels use one of these to [[spoiler: settle the legacy of the Sith. The inevitable battle between Bane and Zannah takes place when he tries to take over her mind. while Bane was better with the saber than Zannah was, she proved a superior sorceress. There is still a small trace of him left in her, though.]]
** Chronologically much later, in the NewJediOrder novel ''Reunion'', Jedi Knight [[ActionGirl Tahiri]] gets sucked into one of these by her EnemyWithin, an artificially implanted [[ScaryDogmaticAliens Yuuzhan Vong]] personality who is trying to pull a SplitPersonalityTakeover on her. It turns out that neither of them can win, since they've become so tightly linked that destroying one would destroy the other; to save their sanity, they end up doing a SplitPersonalityMerge instead. The whole thing is represented as a sort of really trippy lightsaber duel with injuries carrying over to both combatants.
* In Creator/TimPowers' ''Literature/OnStrangerTides'', the confrontation between sorcerers [[spoiler: Leo Friend and Benjamin Hurwood]] concludes when the former attempts to re-write his own memories to bolster his own self-confidence, and therefore his power. The latter undermines his enemy's attempt to rewrite history in his own mind, crushing his opponent's psyche by exaggerating his recollection of a traumatic humiliating event.
* The ending of RobertSheckley's [[http://www.gutenberg.org/catalog/world/readfile?fk_files=1522240 The Status Civilization]] is this. [[spoiler: The Earth civilization brainwashes children to make them responsible members of society - and this brainwashing includes strong urge to report on oneself in case of committing crime and to commit suicide in case these lessons are ever remembered consciously. Barrent was sent to Omega because he confessed in a crime he never committed, returned to the Earth and had to fight these old urges that took form of the worst memories he got from Omega.]]
* In the ''Series/StarTrekTheNextGeneration'' MirrorUniverse novel ''Dark Mirror'' by Diane Duane, Deanna's mental defences are represented by children's building blocks (when she was being taught to use her powers she heard the term "mental block" and misunderstood). Evil!Deanna batters ineffectively against these blocks, while our Deanna calmly walks into her opponent's mind as though it was her own, because unlike her counterpart, she can admit that, in a way, it is.
* The ''Literature/DoctorWhoNewAdventures'' novel ''Timewyrm: Revelation'' by Creator/PaulCornell is largely set inside the Doctor's mind, which is under attack from the Timewyrm. Different parts of the Doctor's mind are looked after by five of the six past Doctors (Sixth isn't there for reasons we learn later), and there's an area where the six "embryonic" personalities of Doctors-to-come wait to be born.
* In Sergei Lukyanenko's ''Literature/NightWatch'' series, the battle for dominance between Vampires apparently works like this. To an outsider, however, it looks like a glorified staring contest.
* In ''Literature/VeryBadDeaths'', an oversensitive telepath is forced to confront a serial killer. Despite only one of them having psychic powers, this is a genuine battle, as Alan's thoughts are so vile as to be weaponized.
* The Novel ''[[GuildWars2 Guild Wars]]: Edge of Destiny'' has an interesting Example. After being engaged in a fight with [[spoiler:the EldritchAbomination [[OurDragonsAreDifferent Kralkatorrik]], [[InsufferableGenius Snaff]] ]] enters the [[spoiler:dragons]] mind to prepare it for the FinishingMove and finds himself [[spoiler:in a raging storm (a metaphor for Kralkatorrik's anger)]]. He eventually manages to [[spoiler:[[HijackingCthulhu calm the beast]] ]] and leave it behind in a catatonic state making it vulnerable to an attack. [[spoiler:However they [[DoomedbyCanon failed anyway]].]]
[[/folder]]

[[folder:Live-Action TV]]
* ''Series/{{Farscape}}'' made this into an art form with John's confrontations with Harvey-Scorpius. This resulted in one of the best episodes anywhere ever: a Looney Tunes style cartoon showdown, including all the old favourites (painting a wormhole on a wall only for someone to drive through it...).
* In the ''Series/DoctorWho'' serial ''The Deadly Assassin'', the Doctor and the Master tap into [[HilariousInHindsight The Matrix]] (a psychic computation matrix) and have a battle of the wills--the landscape in the Matrix is created by their brainwaves, so the Master can basically create an entire world through his will and makes the Doctor suffer various tortures in it, nearly killing him.
** In ''The Three Doctors'', the Third Doctor and Omega have a mental battle in which Omega is represented by a goblin-like creature.
** Recently one in ''NightmareInSilver'' where the Doctor and Mr. Clever battle for full control of the mind, although they use a physical game of chess in place of a psychic battle.
* ''Series/{{Highlander}}: The Series''' Duncan [=MacLeod=] has two of these:
** The first one while under the effects of a "Dark Quickening", between his noble self and the evil he has absorbed through centuries of beheading evil immortals.
** The second one against the demon Ahriman.
* The ''Series/RedDwarf'' episode "Gunmen of the Apocalypse" has the main characters enter Kryten's subconscious to help him fight off a computer virus.
** Also in "Terrorform" when the crew face off with Rimmer's Self Loathing monster and later when Rimmer's ressurected self-confidence defeats his inner demons, saving the crew.
* Series/{{Angel}} vs [[EnemyWithin Angelus]], with Faith present as well.
* During ''Series/PowerRangersDinoThunder'', Tommy spent several episodes stuck his Ranger suit, then unable to turn his invisibility power off so [[RealLifeWritesThePlot that his actor could visit his family]]. His first episode back involved him becoming visible again, but putting himself into a coma in the process. He then had to fight his [[GotTheCallOnSpeedDial previous Ranger identities]]. After ''barely'' getting past Zeo Ranger 5 and the White Ranger, he had his ass thoroughly kicked by the Green Ranger, but still refused to quit - at which point they allowed him to wake up and restored his Dino Gem into the bargain.
* Happened a couple of times in ''Series/StargateAtlantis'', memorable examples being Dr. Weir facing off with Oberon in her mind to allow her teammates to escape the other Replicators, Teyla fighting off the Wraith queen's attempts to probe her mind, and Sheppard fighting himself (sort of) in his own mind.
* During the ''Series/{{Supernatural}}'' season six finale, [[spoiler:the wall around Sam's memories of being in Lucifer's cage is destroyed, shattering his psyche into pieces - "normal Sam", the Sam who spent a year without a soul, and the Sam who remembers Hell. Normal Sam kills and absorbs soulless Sam, but the third Sam has no interest in fighting and begs Sam to stay in the dreamscape and spare himself the memories of what happened. When that fails, he allows Sam to absorb him.]]
* In ''TheUnitedStatesOfTara'', [[spoiler:Tara held a conference in her head with her various alters in order to draw up a contract between her and them.]]
[[/folder]]

[[folder:Machinima]]
* ''RedVsBlue'' (more specifically, Church and Tex) took a trip into Caboose's mind while he was semi-possessed. Interestingly, the actual fight against the evil force is done against a backdrop of the actual Red Vs Blue war ... with a few unique ideas of who's involved.
-->'''Sarge:''' [[TalkLikeAPirate Arrr, I be havin' a southern accent. Arrr!]]
[[/folder]]

[[folder:Music]]
* "The Trial", the climax of [[PinkFloyd Pinky Floyd's]] 1979 RockOpera ''The Wall'', features the main character put on trial in his own mind and convicted by a monstrous imaginary judge.
* Kitananx made a song CALLED Battle In The Center Of The Mind.
* "Heaven Tells No Lies" by Music/{{Helloween}} invokes this in the chorus:
--> I'd need a shotgun in my dreams tonight\\
To terminate my rotten side.
[[/folder]]

[[folder:Roleplay]]
* In ''RolePlay/YuGiOhEastAcademy'' Sigmund has one against his partner spirit Freed. However, it's inside ''Freed's'' mind rather than his own.
[[/folder]]

[[folder:Tabletop RPG]]
* ''TabletopGame/DungeonsAndDragons''
** Illusion spells 'Phantasmal Killer' and 'Weird' work a lot like this trope, in that they create a personalized ImaginaryEnemy that get killed the targets who fail to resist their terrors.
** In {{Ravenloft}}, recurring nightmares occasionally attract the attentions of a group of [[EvilOverlord darklords]] called the Nightmare Court, who, [[ExactlyWhatItSaysOnTheTin as their name suggests]], try to play it up until they reduce the ailing victim into a comatose wreck. Needless to say, any adventure involving them is about kicking their [[SuperpoweredMooks ennui]] out of the head of the dreamer while sorting out his issues.
** DarkSun {{sourcebook}} ''The Will and The Way'' introduced "harbingers" and "constructs" -- mental forms that tweak and help to focus telepathic combat powers (the question whether both sides see the same is avoided, since on Athas psionics is well-codified). So you end up with mental attacks and defences put into images such as a giant scorpion trying to undermine a wall or flames trying to burn through a beetle's carapace.
* A possible occurrence in the "Zorandar" setting from Hero Games' "Lands of Mystery". If you get captured by one set of enemies, they'll try questioning you telepathically. Resist, and the telepathic struggle is gamed out as a one-on-one fight between your interrogator and you. If you lose the fight, the interrogator gets the answer to whatever question set this in motion. If you win, you wake out of the mind trance to find your interrogator has just suffered a brainfry (and if you can't figure out that this is the perfect time to escape ....)
* The Sidereal charm Meditative Battlefield Escalation in ''{{Exalted}}'' works this trope somewhat in reverse. Instead of an invading force attacking a defender's psyche, the Sidereal creates an entire battlefield in their own mind and draws their enemies into that. Then they have supernatural Fist-fights in the center of their own mind.
* ''TabletopGame/{{Deadlands}}'' sees one of these happen if someone becomes Harrowed. Their soul wages war against the manitou in their body, in a setting based on the character's worst nightmare. The winner gets to control the body.
[[/folder]]

[[folder:Theme Parks]]
* This is the entire premise of the ''Theatre/{{Fantasmic}}'' show at Ride/DisneyThemeParks, with several Characters/DisneyVillains invading the imagination of Mickey Mouse.
[[/folder]]

[[folder:Video Games]]
* In ''VideoGame/DungeonsAndDragonsOnline'', the quest 'Finding the Path' involves protecting your mind (embodied in a glowing orb) against the assault of Dreaming Dark creatures, before confronting the cultists in real life.
* Raz in ''VideoGame/{{Psychonauts}}'' fights (and helps defeat) the {{Freudian Excuse}}s lurking in people's brains-- such as a painter's anger (which manifests as a bull), a former insane asylum warden's split personality (which looks like [[NapoleonDelusion Napoleon]] and against whom he is constantly trapped in a war game), and [[spoiler:The BigBad's and his own father issues, which manifest as an enormous butcher and a taunting zombie ragdoll, respectively.]]
* In ''VideoGame/{{Drakengard 2}}'', Nowe fights one of the boss battles in Manah's mind after she has her [[strike:Heroic]] VillainProtagonist [[HeroicBSOD BSOD]].
* If you decide to attack the Mindflayer Elder Brain in ''NeverwinterNights: Hordes of the Underdark'', it will suddenly trap you inside an illusion where you are waking up from a dream. If you accept it, you get a non-standard game over. If you reject it, you will be attacked by monsters within the dream and upon defeating them you will return to reality and the Elder Brain will beg for mercy, allowing you to make a deal with it or deal the killing blow.
* In ''{{Splatterhouse}} 3'', Rick fights the final boss, [[spoiler:the Terror Mask]], in an AmazingTechnicolorBattlefield that represents his psyche.
* ''Franchise/KingdomHearts'':
** In ''KingdomHearts: Chain of Memories'', when Riku fights off Ansem.
** And there's another one in ''VideoGame/KingdomHeartsII'', [[spoiler:Sora vs. Roxas]].
** Special mention too that [[spoiler:the Awakening seems like a semi-physical place, since Donald and Goofy mention Sora disappearing from the scene]].
** Happens yet again in ''VideoGame/KingdomHeartsBirthBySleep'' with [[spoiler:Ven vs. Vanitas]] and [[spoiler: Terra vs. Master Xehanort,]] with [[spoiler: Aqua]] pitching in during the TrueFinalBoss fight. [[spoiler: The secret ending suggests that Terra and MX spent years vying for control of the new Xehanort's heart.]]
** Unfortunately, the next game in the series, ''VideoGame/KingdomHeartsDreamDropDistance'' strongly implies that that last battle in the center of the mind from Birth by Sleep only lasted for a year rather than the several years we were led to believe, and we have yet to learn what happened to the loser.
*** Cranked UpToEleven in the same game, where it turns out [[spoiler:Riku had been fighting off the Nightmares within Sora's dream imaginings of the Sleeping Worlds. His boss fight with Ansem also takes place in the "Darkness within Darkness" of Sora's dream. Then, in the TrueFinalBoss fight, Riku fights off the Armored Ventus Nightmare within Sora's Heart.]]
* The purpose of [[AmericanMcGeesAlice Alice's nightmarish return trip through Wonderland]] is this.
* ''VideoGame/TheIncredibleHulkUltimateDestruction'' has a boss battle in Bruce Banner's subconscious, where the Hulk takes on Banner's underlying hostility and malevolence, officially dubbed "Devil Hulk".
* Sort of happens in ''VideoGame/{{Earthbound}}'', as Ness has to fight his own Nightmare at the end of his [[DreamLand dream world]] known as {{Magicant}}. (Averted in ''Mother'' as that Magicant is [[spoiler:Maria]]'s dream instead of Ninten's. A fight with Lucas's Nightmare was removed from ''Mother 3'', which has no Magicant.)
* Happens near the end of ''PlanescapeTorment'' when you have to enter a mindtrap and [[spoiler:meet three of your most important previous "incarnations" inside. If you manage to take them over or merge with them, you gain their memories and a lot of XP. If you fail the merger you have to destroy them, which gets you no memories or XP. The success of the merger is determined by stats and conversation options, one can only be taken over if your willpower is above a certain level, while another is much easier to convince to merge if you can gain his trust by convincing him that you and him are the same person.]]
* Late in ''VideoGame/JeanneDArc'', [[spoiler:Jeanne]], Gilles, and Richard are whisked into an abstract representation of [[spoiler:Roger]]'s heart, bound by chains by the [[LegionsOfHell Reaper]] [[SevenDeadlySins Ira]]. The three of them must battle Ira's cronies to destroy his power over [[spoiler:Roger]]; eventually, a manifestation of [[spoiler:[[NotTooDeadToSaveTheDay Liane]]'s]] spirit joins the three heroes to assist them, particularly because [[spoiler:her death]] [[HeroicBSOD is what caused]] [[spoiler:Roger]] [[FaceHeelTurn to submit to the Reaper]].
* In ''VideoGame/FinalFantasyVI'', sleeping at Doma Castle with Cyan in the party will cause the party to be taken into Cyan's mind, where they can battle a demon called Wrexsoul that is feeding off his survivor's guilt.
** Also, the final battle of ''VideoGame/FinalFantasyVII'' [[spoiler:happens inside Cloud´s mind. Shame it's the [[AnticlimaxBoss easiest final boss in history]].]]
* In ''VideoGame/ShinMegamiTenseiI'', you find a young girl ([[spoiler:actually the reincarnation of the Heroine]]) whose mind has been infested by a demon that is devouring her from the inside-out. You have to dive into her mind in order to kill the demon and save her.
* ''VideoGame/TalesOfSymphoniaDawnOfTheNewWorld'': [[MultipleEndings If you go for the good ending]], this is the final battle. Given how different Emil's and Ratatosk's personalities were, though, the player was probably [[{{Foreshadowing}} expecting something like this to happen]] (although it's a lot less confrontational than you might expect -- whichever way the fight turns out, the two accept each other).
* The battle against [[spoiler: The Dark Prince]] in ''VideoGame/PrinceOfPersiaTheTwoThrones'' turns out this way. After some platforming, you end up with him and you, the solution being [[spoiler: to stop attacking and walk away]].
** [[spoiler: Although annoyingly, even if you attack he can't kill you. All that happens it that you need to walk through an army of Dark Prince clones.]]
* Happens no less than ''three times'' in ''VideoGame/JadeEmpire'':
** Two demons vie for control of a little girl's body. You have to pick which one you'll support, and then it's a kung fu battle inside her mind.
** Near the end of the game, you can attempt to wrest control of TheDragon away from the BigBad. You control the ghost of the Dragon's past self and fight its current incarnation.
** When you confront the BigBad himself, he attempts to overwhelm you with despair. Naturally, this means you have to fight some freaky glowing swordsmen named "Despair" in an AmazingTechnicolorBattlefield. You also get to rely on the PowerOfFriendship for encouragement, which takes the form of your allies running up to the "Despairs" and, um, exploding.
* The Kalecgos encounter in ''VideoGame/WorldOfWarcraft: Burning Crusade''. The players are supposed to free the good dragon from a [[OurDemonsAreDifferent dreadlord]] that is [[MindControl mind controlling]] him.
** An odd example where ''you're the invader'' is in the fight with the monster [[DidYouJustPunchOutCthulhu of dubious quality]], Yogg-Saron. During the fight with him, portals into his mind open up, where you to disperse projections visions of an important event in Warcraft lore so that you can access his brain. Of course, he knows you're in there, and he will attempt to [[SanityMeter whittle down your sanity]] and put you under ''permanent'' MindControl, so you have to inflict damage on Yogg-Saron's brain as soon as possible and leave quickly.
** In ''Arthas: Rise of the Lich King'', Arthas winds up in a rather one-sided battle when he dons the helm of domination; He's in a room in his mind with Ner'Zhul, the orc Shaman that became the Lich King, and a cowering child that represents the last of Arthas' humanity. After all is explained, Arthas runs his humanity through without hesitation... [[ICanRuleAlone and then does the same to Ner'Zhul when he approaches to congratulate him.]] It doesn't end here though, as it's revealed in the game proper that the fragment of Arthas' humanity survived as [[SignificantAnagram Methias Linaear]], who kept Arthas just human enough in the depths of his heart that he held the VillainBall instead of annihilating all life on Azeroth as easily as he should have been able to.
* Every boss fight in ''VideoGame/{{Persona 4}}'' is this until close to the end of the game. Although it's more like "Battle In The Center Of The Collective Unconscious".
* Not quite the same, but not quite anything else either: In ''[[Franchise/ShinMegamiTensei Maken X]]'', Kei's consciousness (using Kei's form) spends most of the game standing on a glassy-looking disc in her brain yelling/screeching at her body, now possessed by the Maken.
* Near the end of ''VideoGame/SamAndMaxFreelancePolice'' "Culture Shock", Sam falls under the hypnotic sway of disgruntled former child star Brady Culture. After snapping himself out of it by a blow to the head from the security system at Bosco's Inconvenience Store, Sam finds himself in his own mind. There, he has to dispose of a host of Brady Culture clones that [[HypnoticHead represent Culture's hypnotic influence]].
* The finale of Arcueid's and Archtype Earth's plots in the "Current Code" version of ''VideoGame/MeltyBlood'' is this between them.
* ''VideoGame/BattleMoonWars'' has this in Tohno Shiki's mind while he lies unconscious, fighting internally against [[SuperpoweredEvilSide Nanaya Shiki]]. Unfortunately for him, he also visualizes Akiha and Satsuki in this mindscape and thus is unwilling to fight at first. Insert friendly telepath encouragement as Sion uses Etherlite to join in and help him out.
* The final battle in ''VideoGame/DeadSpace2'', where Isaac fights [[spoiler: Nicole and the Marker]]
* A rather weird one in ''VideoGame/NoMoreHeroes2DesperateStruggle'' where Henry, while unconscious, fights against Mimmy, a manifestation of Travis' various fetishes (being a {{Moe}} RobotGirl), which is apparently brought on by Travis "[[CaughtWithYourPantsDown watching]]" anime in the other room.
* Anyone in the ''VideoGame/{{Penumbra}}'' series who gets infected by the Tuurngait gets one of these, although you only play through Philip's. He and Red both win their battles, retaining a measure of self-control (and, in Philip's case, splitting off his own infestation from the HiveMind to make it an easier-to-manage EnemyWithin.) Everyone else who appears in the series lost and got [[YouWillBeAssimilated assimilated]].
* Happens twice ''VideoGame/BatmanArkhamAsylum'' when Batman gets drugged by The Scarecrow, resulting in massive InterfaceScrew and a FissionMailed before entering a twisted world based on his psyche. However Batman fights it off due to HeroicWillpower, to the horror of Scarecrow. It also happens in the sequel with [[spoiler:the Mad Hatter]].
* In ''VideoGame/TheElderScrollsVSkyrim'', [[MadGod Sheogorath]] takes you to his personal vacation spot: the mind of [[TheCaligula Pelagius the Mad]] and will only agree to leave if you humor him and combat Pelagius' various psychoses with the help of his artifact, the Wabbajack.
* The climax of ''Videogame/{{Metro 2033}}'' [[spoiler: The protagonist is mentally fighting the Dark Ones, who are trying to stop him from annihilating their home - all while the protagonist is on the highest point of Moscow's Ostankino tower as it's crumbling. Failing the fight results in the protagonist falling to his doom from the mental blow.]]
* TheVeryDefinitelyFinalDungeon of ''VideoGame/NeverwinterNights2: Mask of the Betrayer'' [[spoiler:has you and possibly a companion battling the Spirit-Eater itself for control of your soul]].
* ''Videogame/PokemonMysteryDungeon 2'': Marill's brother, Azurill, is locked in a nightmare and unable to wake up due to a legendary Pokemon that can infiltrate and attack other beings in their dreams: [[spoiler:Darkrai]]. With the help of an ex-con Drowzee, the hero and his partner are transferred into Azurill's mind to figure out the cause of the problem.
* In ''VideoGame/KingdomOfLoathing'', one of the annual Mr. Store familiars for 2013, the Angry Jung Man, drops psychoanalytical jars that let you copy and explore the psychoses of various non-player characters, such as the Crackpot Mystic, the Pretentious Artist, and the Suspicious-Looking Guy.
* In ''VideoGame/BladesOfOthersides'', Kona is ''constantly'' fighting one with his SuperPoweredEvilSide. Which side is presently winning affects which form he's in in the physical world.
* If the player presses the B Button during a certain important event in ''VideoGame/TheHalloweenHack'', [[spoiler:Varik enters Dr. Andonuts's mind and discovers the reasoning behind his insanity... And then he winds up fighting Dr. Andonuts' personal demons as well as the doctor himself.]]
[[/folder]]

[[folder:Visual Novels]]
* The sixth arc of ''VisualNovel/UminekoWhenTheyCry'' involves a duel between [[spoiler:Shannon and Kanon]] that is a thinly-veiled version of this, with [[spoiler:Beatrice]] sitting on the sidelines. The seventh arc reveals that this has been the state of affairs within [[spoiler:Sayo Yasuda]]'s head for a good year or two prior to 1986. Once [[spoiler:Beatrice]] is forced off the sidelines by Battler's return, the entire duel is scuttled, however.
[[/folder]]

[[folder:Web Comics]]
* Liquid's battle against the Ghost of Big Boss for control of his body, in ''TheLastDaysOfFOXHOUND''.
* ''DominicDeegan'', several times. The titular character's main strength is his mental abilities. And it's established that on the psycho planes, a being's physical size is directly proportion to how powerful their minds are.
* Shows up in ''Webcomic/SchlockMercenary'' when the titular carbosilicate amorph is infected with nanites that hack into his brain. When Schlock pulls out his plasma cannon, the nanites are initially unimpressed:
-->'''Nanite:''' Look, we told you already... that thing won't work in here. It's just a metaphor."
-->'''Schlock:''' But a meta for ''what''? I have a pretty good immune system...
* A variation occurs in ''CharbyTheVampirate'' when Tony has to use his Alp powers to enter Zeno's mind and help him fight the spirit possessing him. Turns out that Zeno has pretty much given up the fight already and is of no help, so Tony changes tactics and get the spirit to not only force him out but to enter his mind instead. A big mistake, as it gave Tony a massive homefield advantage.
* Torg from ''SluggyFreelance'' faces one of these during the "[[http://sluggy.com/comics/archives/daily/060404 Wayang Kulit]]" StoryArc. In this case he's fighting all of his major past and current LoveInterests. Bit of a subversion, in that killing them only makes things go ''worse'' for him.
* K in ''{{Blip}}'', when she was in rage. First she [[http://blipcomic.com/629/ kicked out her friends]], then for lack of semi-real targets [[http://blipcomic.com/639/ imagined and destroyed]] a [[NinjaPirateZombieRobot Pirate Transvestite Robot]].
* ''Webcomic/TheOrderOfTheStick'': Haley’s “mental constructs” have a habit of bickering amongst themselves, at least until she makes them all sit down and shut up.
* Happens between Artie and Joel in Concession, but ultimately spills over into the real world. Doubles as a subverted IKnowYoureInThereSomewhereFight as unfortunately, that part only works for a little bit.
* Monique from ''Webcomic/{{Sinfest}}'' once [[http://www.sinfest.net/view.php?date=2011-04-17 tried to defeat a rhinovirus with(in) her mind]].
* ''CriticalMiss'' [[http://www.escapistmagazine.com/articles/view/comics/critical-miss/9272-Erin-in-Wonderland explains the principle]].
* ''Series/DoctorWho'' fan Webcomic ''Webcomic/The10Doctors'' features [[spoiler:all ten Doctors versus Dalek Tor (a Dalek version of the Doctor) in a battle for the Tenth Doctor's mind. Features Doctor quotes, Nine with a baseball bat, and a mega-merge Doctor who looks ''awesome''.]]
[[/folder]]

[[folder:Web Original]]
* In the climax of ''WebVideo/ToBoldlyFlee'', [[WebVideo/BadMovieBeatdown Film Brain]] and [[WebVideo/BennettTheSage Sage]] face off against [[spoiler: Ma-ti]] in Spoony's mind.
[[/folder]]

[[folder:Western Animation]]
* Superman going inside Brainiac 5's mind in the second SeasonFinale of ''WesternAnimation/LegionOfSuperHeroes'' stirs him to fight the brainwashing. There was also a FusionDance involved.
* Princess Tekla from ''ShadowRaiders'', who fought Lamprey when the latter took over her body.
* The ''WesternAnimation/TeenTitans'' episode "Nevermore" takes place in Raven's head. It's a scary place.
* ''TheSpectacularSpiderMan'' faced down [[spoiler:the symbiote]] this way.
* The 90s ''WesternAnimation/{{X-Men}}'' cartoon was fond of this, and would make elaborate battles in a mindscape shaped by the combatants, making the grandest, most awesome (and trippy) affairs out of scenes that were basically two people glaring at each other in the comics. The most notable instances would be Professor Xavier versus the Shadow King, Jean Grey and Rogue versus MsMarvel's [[SharingABody transplanted personality]], and Professor Xavier going toe-to-toe with [[EldritchAbomination Dark Phoenix]] in Jean's mind (a duel only shown through a series of effects-laden panels in the comics).
* In an episode of the 90s' ''WesternAnimation/TheIncredibleHulk'' cartoon, Banner was possessed by a demon; Green Hulk and Grey Hulk joined forces to kick him out of their shared body. Several episodes also showed the two Hulks fighting for control when Banner hulked out.
* The symbiote asserts its dominance this way during its introduction in ''SpiderManTheAnimatedSeries'', manifested as the symbiote and a giant Spider-Man costume struggling over Peter Parker. As surreal as it was, it was arguably one of the series' better fight scenes...
* The last episode of Disney's ''WesternAnimation/AladdinTheSeries'' to have Mozenrath in it ended with Mozenrath attempting to possess Aladdin's body after his own suffers total organ failure from overuse of dark magic (which turns out to apparently be the source of his interest in Aladdin through most of the series). After he stops being afraid, Aladdin uses the Power Of Love to curbstomp Mozenrath's ass. This would have been a fitting end for the series BigBad, but being a Disney cartoon he gets better at the end to menace Agrabah another day.
* In ''WesternAnimation/TheFairlyOddParents'', Timmy and imaginary friend brought to life Gary battle in Timmy's mind.
* In ''WesternAnimation/YoungJustice'', Miss Martian and Psimon have a psychic battle of this sort. M'gann is invisible and Psimon is still psychically protected, making it difficult for the fight to be cut short mundanely.
* The last episode of ''MightyOrbots'' has the heroes physically entering the body of their archenemy, the titanic supercomputer Umbra. This results in them finding themselves in his mindscape and having to fight off manifestations of his evil thoughts.
* ''TotalDramaRevengeOfTheIsland'': After [[{{Jerkass}} Scott]] clocks him with a club during "Grand Chef Auto" [[SplitPersonality Mike]] has a showdown in his brain, with his 4 other personalities. He wins.
* In ''WesternAnimation/TeenageMutantNinjaTurtles2012'', Splinter goes up against Rat King this way... and ''loses.'' [[spoiler: It takes Leonardo and ThePowerOfLove to get Splinter back.]][[/folder]]

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