History Main / FantasticVoyagePlot

* In ''Literature/JourneyToTheWest'' (and by extension most adaptations thereof), Sun Wukong shrinks himself and enters Princess Iron Fan's body by hiding in her soup.

* Predating Fantastic Voyage was the short story "A World Unseen" by Joseph Wm. Skidmore, serialized in 1936 in Wonder Stories. Two men shrink [[ http://shrinking.freehostia.com/AWorldUnseen.html]] and wind up in the bloodstream of the wife of one of them.

* Predating Fantastic Voyage was the short story "A World Unseen" by Joseph Wm. Skidmore, serialized in 1936 in Wonder Stories. Two men shrink and wind up in the bloodstream of the wife of one of them. Story is scanned on ComicBookPlus.com

For some reason, visibility is almost never an issue in these adventures, even though the inside of your body would be pitch black, unless fictional humans all have an ambient light organ somewhere in their torso. Also, if the character enters the body by being swallowed, don't expect them to [[AnuscapePlan come out through the other end.]] Alternative exit points typically involve being sneezed or burped out, whether by request to the host or through involuntary means.

* The ''Manga/{{Doraemon}}'' episode "Noby's Tough to Stomach" features Doraemon and Noby going inside Sue after she accidentally swallows an opal that was part of her mother's $5000 dollar wedding ring while eating peanuts.

For some reason, visibility is almost never an issue in these adventures, even though the inside of your body would be pitch black, unless fictional humans all have an ambient light organ somewhere in their torso. Also, if the character enters the body by being swallowed, don't expect them to [[ToiletHumor come out through the other end.]] Alternative exit points typically involve being sneezed or burped out, whether by request to the host or through involuntary means.

%% * Another live-action example is an episode of ''Series/HomeboysInOuterSpace''.

** There was a comic in which ComicBook/TheAtom (Ray Palmer) had to enter the body of a patient to fight an infection. (Given his powers, it would be somewhat surprising to learn that this is the only time that happened.) Then ''Superman'' had to get himself shrunk and go in after him when [[spoiler:the observers on the outside figured out that the microscopic creatures he was trying to get rid of were actually themselves fighting the infection rather than causing it]].
** There's a similar story in a ''Franchise/JusticeLeagueOfAmerica'' comic where the whole JL get shrunk by The Atom and enter someone's body. When shrinking themselves down, they also lost their powers as they had to accelerate their perception of time which threw their physiologies out of whack, resulting in them being briefly imprisoned by the microscopic life-forms.
** Shortly after this, the Atom shrank down ComicBook/{{Steel}}, ComicBook/{{Superboy}} and ComicBook/{{Supergirl}} to enter Franchise/{{Superman}}'s body to help treat a kryptonite 'tumour' he'd recently developed (the Atom was unable to go himself as he couldn't cope with the conditions inside Superman at this time, and Steel was [[spoiler:briefly replaced by the Prankster of all people]]).
** In ''ComicBook/TheUnknownSupergirl'', Kara, who had been affected by a Red Kryptonite meteor, got shrunk to microscopic size, which she used to her advantage to take care of some infectious viruses that were inside Dick Malverne's adoptive father.
** In ''ComicBook/LegionOfSuperHeroes'' storyline ''ComicBook/TheGreatDarknessSaga'', [[spoiler:Yera-as-]]Shrinking Violet kills a Servant of Darkness by shrinking down, entering her body, and expanding inside her blood vessels to give her a stroke.
** The 18th issue of ''Justice League Adventures'', the first of two comic book tie-ins for the Franchise/DCAnimatedUniverse ''WesternAnimation/JusticeLeague'' cartoon, had the Atom shrinking the JLA to enter Superman's body and defend it against microscopic aliens who wanted to control him in order to destroy the mysterious "Evano" who killed their scouts years earlier. [[spoiler:It turns out Evano is Evan O., the owner of a comic book store, and as a kid he found their spaceship, thought it was a toy, and put it in water]].

* ComicBook/AntMan of ''ComicBook/TheAvengers'' got to do this when he had to get inside his teammate ComicBook/TheVision in order to fix a malfunction inside him, during ComicBook/AvengersTheKreeSkrullWar. It was done again, as a MythologyGag, in ''ComicBook/HeroesReborn''.
** The second Ant-Man had a variation of this when he had to shrink down and enter Iron Man's armor to repair it after Tony was trapped inside the suit due to damage sustained in a battle with the Hulk.
** Scott Lang did this more literally when he was part of a team helping to cure Bruce Banner's [=ALS=], as he shrank down and entered the Hulk's body so that he could literally alter Banner's DNA to cure him of the disease.
** Pym did it again in ''ComicBook/NewAvengers'' to retrieve a device on Luke Cage's heart, bringing ComicBook/DoctorStrange with him.
* In ''ComicBook/TheSimpsons'' comic, Mr. Burns has become ill from suppressing his need to burp for decades. To undo the blockage that built up in his system, Burns' scientists plan to drop a shrunken submersible into his body. Though the pod can be remote controlled, they still need a pilot in case of an emergency. Since even 'an anthropod will do' Homer is selected.

* In a later issue of ''ComicBook/ROMSpaceKnight'', Rom and Starshine reduce themselves by the use of Ant-Man's technology to submicroscopic size so they can enter the body of an ant and find a way to defeat a semi-mystical plague.
* ''ComicBook/{{Teenage Mutant Ninja Turtles|Mirage}}'':
** Volume 4 featured a variation similar to ''Futurama'''s: instead of shrinking down, the turtles sent millions of mentally-willed [=NanoTurtleBots=] into April O'Neil's body, which had been infected by millions of [=NanoBaxterBots=].
** Later they have a straight example, going into April's sister's body to fight off "alien cancer".
* ''[[ComicBook/SaturdayMorningAdventures Teenage Mutant Ninja Turtles: Saturday Morning Adventures]]'' "Big Trouble in Master Splinter" has an example similar to the original comic above, with the turtles going into Splinter's body, since he is the one infected with [=NanoMousers=].
* In ABC Comics' ''ComicBook/TomStrong'', Tom and his gorilla sidekick Solomon have to shrink themselves to enter the body of the malfunctioning robot butler Pneuman (which is more complex than it sounds because Pneuman had originally been a Steampunk robot in the 1890's and had been upgraded continuously right into the 21st century, so his innards contained everything from gears to vacuum tubes to atomic reactors to nanites).
* The Annual issue of ''ComicBook/TransformersMoreThanMeetsTheEye'' opens with a group of Autobots led by Rodimus entering Ultra Magnus to destroy a colony of lethal [[{{Nanotechnology}} nanocons]].
* An issue of ''[[ComicBook/XMen Wolverine and the X-Men]]'' had members of the X-Men shrink down and enter the body of Kitty Pryde to eliminate a Brood egg that had entered her system. Please note, that this is immediately after Hank just finished teaching a biology class on mutant genetics that took place in Toad's body with the same process.
* The tenth and final issue of the ''ComicBook/{{Madballs}}'' comic book published by Star Comics (a now defunct subsidiary of Creator/MarvelComics) had the Madballs Touchdown Terror, Bash Brain, and Fist Face enter the body of their arch-enemy Dr. Frankenbeans so that they could cure him of a virus.

* In the cartoon segments of ''Series/TheAquabatsSuperShow'', the band shrinks down to infiltrate Jimmy the Robot's body in order to rid him of his parasites that make him malfunction. Humorously, [[TakeOurWordForIt it is never explained]] ''how'' they shrunk themselves down, it just happens.
* [[DiscussedTrope Joked with]] in the opening scene of the ''Series/{{Community}}'' episode "Conventions of Space and Time", when Troy explains to Britta that them dating might cause Abed to relapse into another meltdown, and have to resort to this trope to bring him back. [[spoiler:Abed already knew, but didn't say anything because he liked the donuts that Britta brought to their apartment.]]

* The German-Polish six episode series Die Insider: Micro Podroz [[https://www.fernsehserien.de/die-insider]]takes two scientists in a miniaturized spaceship and has them explore the human body. They bounce off a nose hair and into a nose; collide with an eyeball and then shrink even smaller to explore vision, and are almost consumed by a macrophage.

** In the [[Creator/{{TomBaker}} Fourth Doctor]] serial "[[Recap/DoctorWhoS15E2TheInvisibleEnemy The Invisible Enemy]]", miniaturized clones of the Doctor and Leela enter the Doctor's body to fight a virus. [[spoiler:They fail, but clone-Leela's dissolving corpse imbues the Doctor with immunity to the aforementioned virus.]]
** In the [[Creator/{{PeterCapaldi}} Twelfth Doctor]] episode "[[Recap/DoctorWhoS34E2IntoTheDalek Into the Dalek]]", the Doctor, along with Clara Oswald and some human soldiers enter the outer-shell of a malfunctioning Dalek called Rusty.

* Spoofed in an episode of ''Series/FurTV'' when Lapeño, Mervin and Fat Ed’s [[IdenticalGrandson Identical Cousin]] enter Ed’s anus after he overgrows due to infected food.

* The premier episode of the series adaptation of ''Series/HoneyIShrunkTheKids'' did this ''accidentally'' when the family and their fully submersible (just in case) minivan wound up inside Grandpa. They did some impromptu cholesterol removal with the laser windshield de-icer, prompting the mother to ask "[[ReedRichardsIsUseless Why aren't we richer?]]"

* ''Series/TheMiddleman'' episode "The Clotharian Contamination Protocol" had Wendy go inside [[RidiculouslyHumanRobot Ida's]] body to stop nanobots from making her explode. The snarky subtitles [[LampshadeHanging referred to it as]] "Like ''Film/FantasticVoyage''. Or [[DieHardOnAnX Die Hard in an Android]]".
* There's an episode of ''Series/TheMightyBoosh'' called "Journey to the Centre of the Punk", when punk Vince is infected with a Jazz Virus, and Howard and Lester are shrunk in order to destroy it. This is probably the strangest one ''ever'', especially the antibodies singing a song with Howard while he's trying to convince them he's their friend.
* Disney's ''Series/MightyMed'' has an episode where an envious Kaz uses a shrinking ray on Oliver as revenge for "stealing" his crush. It just so happens that a superhero with metallic skin has fallen ill and, as his skin makes x-rays and injections impossible, the only way to find out what's wrong is to send Oliver inside him. It turns out to be the superhero's arch-enemy, who had shrunken himself down to destroy the hero from the inside.
* In the ''Series/MrYoung'' episode ''Mr. Heart'', Adam and Derby shrink down and enter Echo's body without her knowledge to fight a flu virus and allow her to go on a date with Adam that same day. Of course, they do have to find a way out again. When they do get out and return to normal size, Echo accidentally shrinks Adam, Derby, ''and'' herself. The three of them are accidentally swallowed by Slab, [[spoiler:who is seen entering the bathroom during the ending credits, remarking that his favourite stall is free]].

* ''Series/StarTrekDeepSpaceNine'' episode [[Recap/StarTrekDeepSpaceNineS06E14OneLittleShip "One Little Ship"]] played with this by having a space anomaly shrink down a runabout. While Dax, O'Brien and Bashir weren't inside a human body, they were on board the Defiant during an attack by the Dominion and many of the same issues applied. One key component of the shrinking plot was that the ship had been shrunken at the molecular level- this meant that the air outside the ship would've been fatal to them if they had tried to breathe it due to the size of the molecules.
** Played straight in the MMORPG ''VideoGame/StarTrekOnline''. There's a fan-made mission that uses the same "subspace compression" technique to shrink the party and enter someone's body.
* ''Franchise/UltraSeries''

** ''Series/UltramanEighty'' had two episodes where 80 did this. The first was "The Visitor from Space", where an old friend of 80 named Alma comes to Earth to study [[ThePowerOfHate negative energy]] with her snail-like Jakki. However, Jakki absorbs too much negative energy and goes rogue until it is accidentally consumed by a zoo elephant, transforming the elephant into the giant monster Zuruzlar and forcing 80 to shrink himself and go inside Zuruzlar to subdue Jakki. The second was "I'm a Monster, You Guys!", in which a boy named Tetsuo eats an alien seed on a dare and is turned into a child-sized monster by it (though he still acts and thinks like a kid). The climax sees 80 shrink down and go inside Tetsuo to defeat the space plant.

* In ''Series/ChoujinSentaiJetman'' episode 43, the Jetman (minus Kaori) shrink Jet Icarus to go into the Commander's body to save her from a Bio Dimension Beast.
* When Creator/KirkDouglas hosted an episode of ''Series/SaturdayNightLive'', he played a "microdentist" in a sketch that spoofed the movie ''Film/FantasticVoyage'' listed above under live action films.

* The ''Videogame/{{Doom}}'' user mod DTS:T featured a level like this with the player wandering inside a human body- although to keep the level playable, the anatomy was incredibly bizarre.
* In one of the missions in ''VideoGame/EliteBeatAgents'', the EBA enter a track star's body in order to encourage his immune system (anthropomorphized as a nurse) in its battle against a rather nasty virus. And in the [[VideoGame/OsuTatakaeOuendan original Japanese game]], the Ouendan squad helps antibodies fight off what appears to be food poisoning in a musician.
* In ''VideoGame/FinalFantasyXIV'', players have to exploit this trope during the fight against Cerberus in the World of Darkness. Anyone who stands in Cerberus' sticky drool will end up chomped and instantly killed; however, if they let the Gastric Juices hit them with the Mini debuff first, they'll be swallowed whole instead and get a chance to punch the daylights out of Cerberus' stomach lining, causing the beast to collapse and leaving him vulnerable.
* In ''VideoGame/FinalFantasyLegendII'', the party must travel inside Kai in order to fight off micronized soldiers of Ashura and extract the Magi from Kai. [[spoiler:While this saves her life, it also means that she can't heal you afterwards since the Magi granted her healing powers.]]
* The text adventure game version of ''VideoGame/TheHitchhikersGuideToTheGalaxy1984'' included a sequence where Arthur would find himself exploring his own brain.
* ''VideoGame/XMultiply'' is a shump set inside a human body, where you pilot a microscopic fighter called an X-002 to battle an alien virus.
* ''VideoGame/LaMulana'': [[spoiler: The Ruins of La-Mulana are the Mother's body, and the true form of the final dungeon is a hybrid ruin/WombLevel]]
* Done twice in ''VideoGame/{{Okami}}''. First, a shrunken Amaterasu has to enter the Emperor's body, through his mouth, to stop whatever it is that is making him exhale a noxious gas. A much longer trip involves a full-sized Ammy leaping down the gullet of the Water Dragon and exploring its innards, [[spoiler: causing such wounds in the process that the Dragon dies from internal bleeding]].
* The Platform/ZXSpectrum game ''[[SerialNumbersFiledOff Blood And Guts]]'', in which a miniaturised character must collect bits of a submarine and reconstruct it in the brain in order to escape through the eye, all the while using a laser to fight infections, random white blood cells to clear growths, and collecting red blood cells for oxygen. Eventually Quicksilva decided to abandon all pretense and re-released the game as ''Fantastic Voyage''.
* In ''VideoGame/MoshiMonsters'', the "20,000 Leauges Under the Fur" mission has Elder Furi be rendered sick and the monsters must shrink themselves and go into his body to remove Glumps that [[ItMakesSenseInContext are in there]].
* ''VideoGame/GearsOfWar2'' has Delta Squad swallowed whole by a [[spoiler:giant riftworm that's been sinking human cities]]. Marcus and the gang have to kill it from the inside out using ''freaking chainsaws.''
* Bodyworks Voyager was an educational game from 1994 that was set TwentyMinutesInTheFuture and involved a crack team of commando-doctors trained to pilot fighter ships that were shrunk and injected into a patient's body, where your task was to shoot germs. Considering this came out years before VideoGame/TraumaCenter, some of the bugs were just damn HARD.
* The FMVGame ''VideoGame/{{Microcosm}}'' was a space shoot-'em-up with this plot.
* Midgame in ''VideoGame/FinalFantasyII'' you are swallowed by Leviathan and must fight your way out of him.
* ''Rex Ronan: Experimental Surgeon'', an anti-smoking EdutainmentGame for the SNES, had the title character shrinking himself to enter the body of a dying smoker to eradicate tobacco-induced ailments and MechaMooks sent by the evil tobacco company.
* ''VideoGame/{{Gradius}}'' spinoff ''[[GaidenGame Salamander]]'' was retooled in the arcade as ''Life Force'', set inside a [[PlanetEater planet-devouring]] EldritchAbomination named Zelos.
* ''VideoGame/KingdomHeartsI'' has a Monstro WombLevel, which has more anatomical detail than the [[WesternAnimation/{{Pinocchio}} film it's based on]].
* For some unknowable reason (wanting to make good use of the textures?) ''VideoGame/BreathOfFireII'' is in love with this setting: over the course of the game, Ryu journeys inside a whale (to kill the monsters nesting inside of it and wake it up), a tree (to cure its senility), and an overweight queen (to exterminate the calorie demons inside her organs.)
* The Platform/{{Intellivision}} game ''Micro Surgeon'' had this as its plot.

* Amiga game ''VideoGame/{{Vaxine}}'' had you fighting diseases within different organs of the body, only the playing field was an infinite chessboard and the diseases were represented by bouncing balls.

** The plot of ''VideoGame/MarioAndLuigiBowsersInsideStory'' has the brothers working with Bowser after the latter ended up sucking them up inside of him.
* In Irem's shooter ''X Multiply'', the spaceship X-002 gets miniaturised and injected into a space colonist's body to defeat an alien virus. You even get to see the X-002 coming out of the tip of a syringe at the very beginning of the game.
* The 1983 Apple II game ''VideoGame/{{Microbe}}''. A miniaturized submarine and crew are injected into a patient's leg vein. They must proceed through various organs and blood vessels to the brain, where they will fix the patient's problem. Certain organs provide specific benefits: the submarine can refuel in the liver and get more air in the lungs.
* ''VideoGame/ProjectRemedium'' is an {{FPS}} set inside a human body, where you play as a nanobot shooting assorted diseases and illnesses.
* ''VideoGame/RatchetAndClankSizeMatters'' has a level where Ratchet must travel inside Clank in order to reboot him after he is attacked by Technomites.
* ''VideoGame/TheWonderful101'' has a chapter where the team must travel inside the body of Prince Vorkken to prevent a nano-bioweapon called Vaaiki from killing him.

* ''Franchise/TheLegendOfZelda''
** ''VideoGame/TheLegendOfZeldaOcarinaOfTime'' features Inside Jabu-Jabu's Belly, which is a dungeon set inside the body of a giant fish, where you have to kill a parasite that is affecting his behaviour. On the flora side of things, the very first dungeon in the game has you do the same for a giant, sentient tree (Inside the Deku Tree).
** ''VideoGame/TheLegendOfZeldaOracleGames'' reuses the two concepts from ''Ocarina of Time''. For both the Maku Trees, within each of them lies the Hall of Secrets, where you can get special items and upgrades in a linked game, and for each essence you obtain, the trees begin to grow and it is after finding the final essence, you can access the very top of the trees. In addition, Jabu-Jabu's Belly serves as the seventh dungeon in ''Oracle of Ages'', where you have to lower and raise the water level a few times until you reach and defeat Plasmarine to obtain the seventh Essence of Time, the Rolling Sea.

[[folder:Web Original]]
* ''WebVideo/TheAnnoyingOrange'' episode "Fruit-tastic Voyage" sees Orange and the other fruits traveling inside Nerville in order to remove a laser that had been implanted in his brain by broccoli aliens.
* Parodied in the ''WebVideo/{{Smosh}}'' sketch "Adult Magic School Bus" where Ms. Frizzle (played by Ian) forces the rest of the class on a trip inside of her ex-husband's body to "find out what the inside of a 55-year-old husband's cheating heart looks like." [[BloodyHilarious And then deliberately grows her car back to normal size without leaving his body]].
* In the ''WebVideo/SuperMarioLogan'' episode, "Jeffy Gets Stung By a Bee!", Mario and Brooklyn T. Guy believe that Jeffy swallowed the rare Banana Butterfly, which, when digested, causes the victim's arms to fall off and the victim to turn into a banana, so they shrink themselves down to microscopic size and pilot a microscopic submarine to get the butterfly out of Jeffy's stomach. When it turns out that Jeffy swallowed a bee, they are angry at Jeffy for making them waste their time on him. [[spoiler:Then it turns out that Jeffy really did swallow a banana butterfly along with the bee.]]

-->'''Lewis''': This is like that film, where they got shrunk down.\\
'''Duncan''': "[[WesternAnimation/TheMagicSchoolBus Magic School Bus]]"?\\
'''Sips''': "Film/HoneyIShrunkTheKids And Then A Whale Ate Them"?
-->'''Sjin''': "Film/AntMan1"?
-->'''Simon''': "Film/{{Innerspace}}"?\\
'''Lewis''': Yes, that's the one!\\
'''Duncan''': That's happened on so many things.

* In one episode of ''WesternAnimation/TheAdventuresOfJimmyNeutronBoyGenius'' Jimmy and Sheen go inside Carl's body in order to get DNA so that Jimmy can make a cure to an illness. Of course, there is then the trouble of how you get out... But they soon decide that they should make Carl sneeze them out.

* The episode of ''WesternAnimation/AlvinAndTheChipmunks'', "Inner Dave", where the boys are accidentally shrunk by one of Simon's inventions. They end up going inside Dave's head in order to try telling him what happened.
* ''WesternAnimation/AquaTeenHungerForce'', "Unremarkable Voyage": After Meatwad swallows an experimental computer chip, Frylock shrinks himself to go in and get it. Thanks to a few screw ups, both he and a miniaturized Carl eventually wind up inside Master Shake. They then have to beat their way out of Shake's eye, killing him in the process. [[NegativeContinuity No worries though.]]
* ''WesternAnimation/{{Archer}}'' episode "Drastic Voyage" had the group use the shrinking technology to remove a blood clot from the man who invented the shrinkray, in a direct WholePlotReference to the film. [[spoiler: Unfortunately, Krieger interfered with the procedure, causing them to be injected into the man's foot, rather than his neck. It's about the first example when they fail, returning to their size while still in the man's head, killing him instantly.]]
* ''WesternAnimation/{{Arthur}}'': Doesn't really happen, but in "[[Recap/ArthurS4E3BustersBreathlessTheFrightStuff Buster's Breathless]]", [[CloudCuckooLander Buster]] [[BigEater Baxter]] tries to explain his asthma by telling his classmates to ''imagine'' themselves inside his lungs.
* The ''WesternAnimation/BatmanTheBraveAndTheBold'' episode "Journey to the Center of the Bat!", starring Aquaman, the Atom, and the cutest lymphocyte EVER.

* This also forms the plot of the ''WesternAnimation/CaptainNTheGameMaster'' episode "[[Recap/CaptainNTheGameMasterS2E13GermWars Germ Wars]]": the rest of the N Team shrinks down to enter Captain N's body to help him fight off a disease.
* On ''WesternAnimation/CaptainPlanetAndThePlaneteers'', the shrunken Planeteers battle microbes from polluted water inside Kwame after he accidentally drinks them.

* ''WesternAnimation/CodenameKidsNextDoor'' has "Operation S.P.R.O.U.T," in which Numbuh Four accidentally eats a Brussels sprout, and Numbuhs One, Two and Five have [[RaceAgainstTheClock six minutes]] to shrink themselves and enter his body to retrieve it before he digests it. [[spoiler:They succeed, but then Numbuh Four [[HereWeGoAgain accidentally eats a piece of liver]]!]]
* There is an episode of ''WesternAnimation/CowAndChicken'' called "Journey to the Center of Cow" where Chicken was accidentally swallowed by Cow. This is a rare example of when someone was not shrunk.
* ''WesternAnimation/CuriousGeorge'': Happens in "Inside Story", where the titular character doesn't feel well and has a dream where he and Gnocchi fight the germs that have invaded his body.
* ''WesternAnimation/DangerMouse'' has an episode where DM and Penfold use Baron Greenback's shrink ray to follow the villain inside Colonel K. to defeat the toad's terrible plot.
* ''WesternAnimation/DexHamiltonAlienEntomologist'' has an episode where the crew have to travel into the body of sick SpaceWhale in order to cure it.

** "Tiny Timmy" - Timmy shrinks down to microscopic size to do a biology report and ends up inside Vicky. This is treated in an almost joking manner, with Vicky's insides [[AnthropomorphizedAnatomy treated as a building with multiple workers]]
** A straight-edge example would occur years later in Season 10, with the episode "One Flu Over the Crocker's Nest"; involving Timmy and Chloe going inside Mr. Crocker to destroy a fairy virus after Cosmo sneezes on him.

* The ''WesternAnimation/GodzillaTheSeries'' Season 2 episode "What a Long, Strange Trip It's Been" had Nick and Monique venture inside Godzilla Jr. For obvious reasons, shrinking wasn't required.

* The ''WesternAnimation/IAmWeasel'' episode "The Incredible Shrinking Weasel" had Weasel and Baboon shrink to repair a crack in the Red Guy's butt bone.
* ''WesternAnimation/InvaderZim'' miniaturized himself and his spaceship to go invade Dib's brain after Dib manages to get proof of Zim's alienness in the episode "Nanozim".
** Dib then swallowed a nanobot and had Gaz remote control it, eventually leading to Dib's robot and Zim's robot fighting near Dib's brain.
* The ''WesternAnimation/IronManTheAnimatedSeries'' episode "Iron Man, On the Inside" does this; Hawkeye's spine is injured in a fight, and Tony has a technological fix but no way to safely insert it. So naturally he goes for hand-delivery. This is further complicated when a similarly-shrunken Ultimo tags along (controlled by a computer hacker who had also hacked into HOMER and made him act bizarrely).
--> "You're giving Hawkeye a heart attack!"\\
(Tony is trapped in a ventricle) "Yeah, and it's me the heart's attacking!"

* The ''WesternAnimation/JusticeLeagueAction'' episode "Inside Job" had Batman, Wonder Woman and the Atom shrink and travel inside Superman to save him from nanites Lex Luthor put in his body that are draining him of his strength.
* The ''WesternAnimation/LiloAndStitchTheSeries'' episode "Poxy", where they must chase after an experiment of microscopic size that is inside Pleakley's body.
* ''WesternAnimation/LittlestPetShop1995'' had this when Delilah managed to eat Vim, causing Stu and others to go into Delilah to rescue her, where they went into several of Delilah's organs, although with lots of artistic interpretation.
* Several WesternAnimation/LooneyTunes shorts inverted this, by sending WesternAnimation/BugsBunny or another character running over and through the body of a giant as if it were a building (including pulling shades down over the giant's window-eyes). These no doubt influenced ''WesternAnimation/TheRenAndStimpyShow'' version below.
* ''Literature/TheMagicSchoolBus'' once took a tour through the human body in one of the books that spawned the TV series, and then ''seven'' times in the TV series: Arnold was the "victim" in the book and the show's adaptation of it ("For Lunch"), with him accidentally ingesting the shrunken bus while eating a snack (which was later adapted into a computer game), while Ralphie and Ms. Frizzle had their turns as well, to investigate the body's immunity system ("Inside Ralphie"), and muscular systems ("Works Out") respectively. Then they wound up going inside Arnold ''again'' to figure out what had made his skin turn orange ("Goes Cellular"). Later on, Arnold's cousin Janet gets her turn when the class goes inside her nose to study smell ("Makes a Stink"). In "Gets Eaten", they go inside a tuna fish, and in "Cracks a Yolk", they go inside a chicken (and [[AccidentalInnuendo get laid]]).
* The ''WesternAnimation/MegaBabies'' episode, ''Inner Ear Inferno'' involves Meg and Buck being shrunk and travailing inside Derrick in order to find the cause of his ear infection.
* One episode of the ''WesternAnimation/{{Mickey Mouse|2013}}'' series of 2013-'14 is called "[[Recap/MickeyMouseS2E5DownTheHatch Down the Hatch]]", in which WesternAnimation/MickeyMouse and WesternAnimation/{{Goofy}} are accidentally miniaturized by a ShrinkRay and then are inadvertently swallowed by WesternAnimation/DonaldDuck. They explore his body [[spoiler:, but when he learns they are in there, the duck tries all he can to get them out. In the end, as the shrinking effects wear off, Mickey and Goofy emerge from Donald by way of [[EggLayingMale a giant egg, laid by Donald, a]] ''[[EggLayingMale male]]'' [[EggLayingMale duck!]]]]
* ''[[WesternAnimation/MightyMouse Mighty Mouse: The New Adventures]]'' used this in the episode "Mundane Voyage" where Mighty Mouse and Pearl Pureheart are miniaturized and sent into the President's body to save his life.
* Done in ''WesternAnimation/MonaTheVampire'', in the episode "The Sam n' Ella Infiltration", to enter the body of someone who is sick.
* An episode of ''WesternAnimation/MuppetBabies1984'' had Kermit, Piggy, Gonzo and Skeeter use their imaginations to shrink down to germ-size and give Scooter's bumbling immune system a hand when he catches a cold.
* In the ''WesternAnimation/MuppetBabies2018'' episode, "Don't Over Duet", the babies use Bunsen and Beaker's miniature submarine to travel inside Piggy's body and find her missing voice box in time for a duet that she's going to sing with Rowlf. Piggy has to learn the importance of taking a break while the other babies search her body, as talking, moving around, and making loud noises all compromise the mission.
* ''WesternAnimation/NateIsLate'' has an episode "The Spore" where two main characters, Nate and Malika enter their gardener friend body, Violet, to destroy the spore inside her stomach.
* The ''WesternAnimation/NedsNewt'' episode "Fantastic Neddage" where Ned catches a cold and Ned and Newton travel inside his body to find a cure for it.
* ''WesternAnimation/TheNewAdventuresOfHuckleberryFinn'' has an episode "The Mission of Captain Mordecai" where the three main characters, Huck Finn, Tom Sawyer and Becky Thatcher get swallowed by a giant whale while trying to escape a mad Ahab-like sea-captain who was trying to force them to be his new crew in his mission to kill said whale. To make matters worse, the giant whale also swallows the captain when he falls overboard while trying to harpoon it, and the rest of the episode deals with the young trio trying to evade the murderous captain while endeavoring to find a way out of the beast, which they finally do by climbing out its blowhole, the whale helping them along by blowing them out.
* In the ''WesternAnimation/OggyAndTheCockroaches'' episode "Globulopolis", while Dee Dee is swimming in a cup of yogurt, Oggy drinks it up, and Dee Dee along with it. Dee Dee then travels around the insides of Oggy and discovers [[GhostInTheMachine white tiny ghost-clones]], repeatedly punches Oggy's bladder as if it was a punching bag, and makes his stomach rumble by eating consumed fish inside it. [[spoiler:In the end when he gets out, he ends up in Oggy's nose and flies into Jack's mouth along with Joey and Marky]].
* In the ''WesternAnimation/PennZeroPartTimeHero'' episode "Totally Into Your Body" Boone and Sasha were teleported into a sick Penn's body.
* ''WesternAnimation/PhineasAndFerb'': On the episode "Journey to the Center of Candace", When Isabella's dog Pinky eats her sash, the boys try to go inside and retrieve it, but accidentally get to Candice’s body instead.
* ''WesternAnimation/PinkyAndTheBrain'' did this in order to foil an intelligibly-enhanced cat's DanceSensation plot from being carried out properly by a band, by shrinking themselves and letting themselves get ingested by one of the band members. Unfortunately for them, they get eaten by the completely wrong guy, but they made the best of the situation by having the guy stand in for them.
** Done also in the comic book, in which they attempted to enter the President's brain, but ended up inside the First Dog.
* ''WesternAnimation/QuackPack'' had an episode where a germ-loving scientist invades Donald's body, with Huey, Louie and Dewey being shrunk and sent inside their uncle in order to stop him.
* ''WesternAnimation/TheRealGhostbusters'''s Episode "Mean Green Teen Machine" has Egon giving a conference inside a human vein (as part of a DreamSequence).
* ''WesternAnimation/ReBoot'', "The Great Brain Robbery": Megabyte miniaturizes a mercenary named Mouse and his flunkies Hack and Slash and sends them to probe secrets from Bob's brain. Except they accidentally end up in Enzo's body instead, and Bob goes in after them.

* Inverted on a later episode of ''WesternAnimation/TheRenAndStimpyShow'' called "Blazing Entrails"; a boy genius inflates Stimpy's body with a bicycle pump to ridiculous proportions, so that Ren can enter his body and find out why Stimpy is acting even stupider than usual.

** In the [[WesternAnimation/Rugrats1991 1991 series]] episode "[[Recap/RugratsS2E12AuntMiriamTheInsideStory The Inside Story]]", Tommy and co. go inside Chuckie to retrieve a watermelon seed, though Angelica tags along with the intent to make the seed grow and Chuckie's stomach explode. In keeping with the relatively mundane setting, it's AllJustADream (and once Chuckie wakes up from it, he expels the seed with a burp anyway).

* In a tongue-in-cheek episode, ''WesternAnimation/SamuraiJack'' once had to enter an ailing dragon's body to cure its devastating flatulance.

* In the second season finale of ''WesternAnimation/TheSecretSaturdays'', the first final battle between [[spoiler:Zak and Argost takes place inside the body of the super cryptid [[strike: Kur]] fake Kur.]]

* The ''WesternAnimation/SouthPark'' episode "[[Recap/SouthParkS8E12StupidSpoiledWhoreVideoPlayset Stupid Spoiled Whore Video Playset]]" did a twisted parody of this trope, in which a gerbil named Lemminwinks had to find his way out of Mr. Slave's ass. And then it happened again with ''Creator/ParisHilton''.

** "[[Recap/SpongeBobSquarePantsS1E3JellyfishingPlankton Plankton!]]": In Plankton's first appearance in the series, he takes control of [=SpongeBob=]'s brain and makes him make and hand-deliver a Krabby Patty to him personally.
** "[[Recap/SpongeBobSquarePantsS4E15SquidtasticVoyageThatsNoLady Squidtastic Voyage]]": [=SpongeBob=] and Patrick once entered Squidward's body in order to remove a clarinet reed stuck in his throat. They also screw around with his brain. [[spoiler: Unfortunately, after completing the task, Patrick accidentally made them re-enlarge while still inside Squidward. While he didn't burst, he did swell up big time from having a full-grown submarine inside of him.]]
** "[[Recap/SpongeBobSquarePantsSomeonesInTheKitchenWithSandyTheInsideJob The Inside Job]]": Plankton plans to use his new invention, a mind connector, to try to obtain the Krabby Patty formula from Mr. Krabs's brain, but instead of being launched into Mr. Krabs's head, he ends up inside [=SpongeBob=], the second time he enters his body. Traversing [=SpongeBob=]'s brain and heart, Plankton succeeds in getting the information he wants, but the mind connector soon reveals to have a very nasty side effect when it absorbs the contents of that person's body: it corrupts the wearer's personality and delivers a PainfulTransformation to make said wearer look and sound like the person whose information they're absorbing. Long story short: when Plankton absorbed the contents of [=SpongeBob=]'s body, his personality and appearance changed to look and sound like [=SpongeBob's=]. [[spoiler:As Karen tries to bring Plankton back to the Chum Bucket, the mission soon fails when the mind connector hits Patrick, causing Plankton's body and personality to look and sound like the dimwitted seastar.]]

** "[[Recap/SpongeBobSquarePantsS11E23AppointmentTVKarensVirus Karen's Virus]]": Karen gets sick after she caught a computer virus from a visiting acquaintance, so Plankton asks [=SpongeBob=] to deal with it. As such, Plankton ''digitalized'' [=SpongeBob=] for him to do so. It turns out that the virus has been eating through Karen's internal circuits and threatened to delete her mainframe (while she does a delusional rampage through Bikini Bottom), until [=SpongeBob=] used a Krabby Patty to pacify and remove it.
* ''WesternAnimation/{{Superfriends}}'': The 1978 episode "Journey Through Inner Space" has a plot similar to the above Iron Man episode. When Aquaman is turned into a prehistoric sea monster through radiation, a shrunken Superman and Wonder Woman inside the Supermobile are injected into Aquaman's monster body to change him back using another dose of radiation. Meanwhile, the other Superfriends try to stop the monster's rampage.
* Used in an episode of ''WesternAnimation/TeenTitans2003'' where Beast Boy turns into a bacterium to fight a computer virus that has taken over Cyborg.

** Cyborg himself gets swallowed by the dragon in "The Night Begins To Shine" miniseries, and encounters a giant killer tapeworm while wandering around in its digestive tract before blasting his way out.
* In "Tick vs. Dot and Neil's Wedding" WesternAnimation/TheTick and company drive a submarine through Dinosaur Neil, who has mutated into a giant dinosaur monster, again, and cure him from the inside. Due to Dinosaur Neiil's size there is no shrinking involved.
* On an episode of ''WesternAnimation/TinyToonAdventures'', Buster, Babs, and Calamity shrink to enter Plucky's head and examine his brain to watch his fantasies.

** ''WesternAnimation/TheTransformers'' has the episode "Microbots," which features Bumblebee, Perceptor, and Brawn shrinking down to enter Megatron and remove a power-enhancing crystal.

* ''WesternAnimation/TucaAndBertie'': The Season 3 finale "The Mole" has the titular mole being a doctor that specializes in exploiting his small size to enter patients and repair them from the inside. When he gets lost inside Tuca, Bertie shrinks down and enters Tuca's body to help him fix a growth from an impending rupture in her vagina. Interestingly, it plays out more like a JourneyToTheCenterOfTheMind plot considering that Tuca's vagina pretty much also functions as her HappyPlace full of homages to her friendship with Bertie.
* One of the many sketches from ''WesternAnimation/TwoDTV'' sees Tony Blair in hospital suffering from an unknown heart condition. The NHS wants to send a shrunken team of scientists into his body to resolve the problem, but John Prescott steps on them. So John Prescott, David Blunkett (and his guide dog), Jack Straw and Tony's wife Cherie Blair are sent. [[spoiler: Turns out that Gordon Brown is the one causing Tony's heart problems, in his latest attempt to become Prime Minister.]]

* The ''WesternAnimation/ThePowerpuffGirls2016'' episode "Sugar, Spice and Super Lice." Although, instead of going inside Buttercup's body, Blossom and Bubbles shrink down and go into her ''hair'' to wipe out some lice.
* ''WesternAnimation/UncleGrandpa'' once shrunk himself and Pizza Steve to get inside a kid's brain and make him better at video games.
* {{Invoked|Trope}}, {{discussed|Trope}}, and {{lampshade|Hanging}}d in ''WesternAnimation/TheVentureBros'' episode "The Diving Bell vs. the Butter Glider". For some reason, Doctor Venture is paralyzed, and they can't use an MRI because there's too much metal in his body, so the logical solution from Billy Quizboy is to get a submarine, shrink it down, and go inside to find the problem. Which turns out to be [[spoiler:a clot in Doc's bloodstream caused by a previous shrunken submarine piloted by previous clones of Hank and Dean, whose skeletons are still there]]. The implication is that Billy was quick to suggest this solution because of what a sci-fi geek he is. He name-drops ''Film/FantasticVoyage'' as a "classic" and defends the quality of ''Film/{{Innerspace}}'', though his assistant dismisses the premise an old cliché.

* In an early part-animated, part-live action ''ABC Series/AfterSchoolSpecial'', [[http://www.imdb.com/title/tt0322745/ "The Incredible Indelible Magical Physical Mystery Trip,"]] a magical being named Timer (who would later appear on ABC's Saturday Morning cartoon block in a series of PSA spots) shrinks two children and takes them on a tour of their uncle's body to better understand the importance of health and physical fitness. A sequel, [[http://www.imdb.com/title/tt0305786/?ref_=fn_al_tt_4 "The Magical Mystery Trip Through Little Red's Head"]] has Timer take two different kids on a tour of their teenage sister's brain to explain how the human mind works, 41 years before ''WesternAnimation/InsideOut''.
* ''WesternAnimation/WackyRaces2017'' has an episode where Dick Dastardly shrinks the other racers to microscopic size in order to win a race that's supposed to take place in an equally tiny race track. He does win by default until it's discovered that the other racers have been accidentally swallowed by Dastardly after winding up in the food he was eating. As a result, the race actually ends in a tie.
* ''WesternAnimation/YinYangYo'': In the episode "Voyage To The Center Of The Yo", Yuck shrinks himself down into Master Yo's body so that he can steal the Toilet Brush of Illumination when the latter retrieves it from the Safety Deposit Box Dimension; Yin and Yang have to shrink themselves down in the battle cruiser and enter Master Yo's body in order to stop Yuck.
* The ''WesternAnimation/OhYeahCartoons'' presented nanorobotic parameciums known as the "Microcops" working to save a sick guy they live inside from an evil virus bug.

* In ''WesternAnimation/YoungJusticeOutsiders'', after Karen [[{{Sizeshifter}} 'Bumblebee']] Beecher gives birth, she's informed by the doctor that her daughter has a hole in her heart. In order to keep her newborn daughter alive until the heart surgeon can arrive, Karen suits up and shrinks down to microscopic size to enter the baby's body and apply a patch to the hole. Once she finishes this, thinking back to her earlier discussion with her husband about the ethics of [[BioAugmentation DNA manipulation to trigger the Meta-Gene]], she then shrinks even further to the point that she can apply the formula she created to a strand of her daughter's DNA...
-->'''Doctor:''' [[LampshadeHanging This is crazy!]] I take the baby ''out of'' the mom; I never put the mom into the baby!