[[quoteright:337:[[Series/{{Alf}} http://static.tvtropes.org/pmwiki/pub/images/ALF-pilot_5264.jpg]]]]
[[caption-width-right:337:An alien? No sir, [[KeepingSecretsSucks we are not hiding any aliens]]. [[Series/{{Alf}} Alf!]] Stop laughing!]]
Some character -- a RebelliousPrincess, an alien, TheChosenOne or the MadScientistsBeautifulDaughter[[labelnote:*]]or Franchise/{{Batman}}[[/labelnote]] -- is on the run, homeless, out of options, and needs a place to hide. It becomes the duty of the first available OrdinaryHighSchoolStudent they come across to stash the hero in their basement/garage/attic/bedroom until they [[SavingTheWorld Save The World]]/defeat the BigBad/find a portal back to their MagicalLand.

The rescuer, whether [[JumpedAtTheCall enthusiastic]] or [[RefusalOfTheCall reluctant]], quickly runs into a big problem. Because they are not a victim of ParentalAbandonment, they have to keep up a [[{{Masquerade}} charade]] of hiding the character from said parents. Family members start to notice that the character's spending a lot of time in his room, acting rather snippy about people going in there, stashing food, and apparently talking to himself. He will make some quick excuses about practicing lines for a school play.

Meanwhile, the hidden character isn't much help, being prone to doing strange things having to do with their origin, or falling in love with their protector's sibling or friend, or being pursued by one of their own.

When the character is eventually found, a quick SecretIdentity, UnpronounceableAlias, or LineOfSightName will be conjured on the spot, along with an unusual job title to explain their strange outfit. If female, the hidden character will frequently end up as a [[{{Meido}} maid]].

As you would expect it is also a popular concept in fanfictions. Mostly in the form of the author him or herself finding his/her favorite and beloved character entering the real world from their media of origin (book, tv, comic, etc.) and befriending them.

HilarityEnsues.

The TropeNamer is the ''WesternAnimation/BatmanTheAnimatedSeries'' episode "I've Got Batman In My Basement," which revolved around a group of local children hiding Batman from the Penguin as he recuperated from a heavy dose of poison. The production team [[CreatorBacklash does not think too highly of the episode]], citing the [[ExecutiveMeddling studio decision]] to make the Penguin resemble his deformed counterpart in ''Film/BatmanReturns'', instead of the comic depiction of a civilized gangster whose nickname comes from his tuxedo and top-hat, as well as the [[TheFamilyForTheWholeFamily bumbling antics]] of the villains.
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!!Examples

[[foldercontrol]]

[[folder:Anime and Manga]]
* Rukia initially hides in Ichigo's closet in ''Manga/{{Bleach}}'' and raids his sisters' wardrobes for street clothes. Ichigo was rather surprised when he found out.
** Once the whole charade becomes a moot point, she continues to live in his closet. Apparently she just likes it in there.
* Haruko in ''Anime/{{FLCL}}'' ends up sharing a bunk bed with the main character while masquerading as a maid.
** This could be considered an inversion from the standpoint that Naota's father invited Haruko in, despite Naota's complaints, so one of the critical points to this trope (hiding it from his parents) does not play a part. Nor is he particularly trying to help and care for her.
* In ''RurouniKenshin'', Seta Soujiro hid the fleeing Shishio. When Soujiro's [[AbusiveParents abusive family]] (he was an illegitimate child) catch on to the missing bandages and food, they corner the boy in an attempt to kill. [[SelfMadeOrphan He snaps]].
* Digimon touches this theme a lot when the action is set in the real world, with the Digimon usually acting as soft toys. The parents usually find out the truth eventually.
** ''Anime/DigimonAdventure'' plays the trope straightest with Izzy to the extent that his parents become concerned that "one day at camp" changed him so much. They're a little more bewildered when Tentomon ends up botching it too.
** Subverted in ''Anime/DigimonSavers''. Masaru tries make a big point to Agumon that he must not, under any circumstances, be discovered by his family... only for both of them to botch it thirty seconds later. [[UnusuallyUninterestingSight Mom took it pretty well, actually.]] Considering [[spoiler: DATS is the reason her husband disappeared]], it's not really surprising.
** Basically averted in ''Anime/DigimonTamers''. Terriermon does play the part of a plush toy (and gets subjected to play dates with Henry's baby sister Suzie), but Renamon is rather skilled at not being seen and she goes off on her own half the time. Takato makes an attempt at this trope with Guilmon, but after about a day he realizes it's not going to work so he finds an abandoned shed or something in a nearby park that Guilmon can live in.
* Pretty much the entire run of ''Manga/DetectiveConan'', where the main character has de-aged ten years and lives with his SheIsNotMyGirlfriend classmate until he can change back. Which he does, briefly, on several occasions. Naturally, more and more people are discovering his secret, including a confidant of the BigBad.
** Also befalls DeadpanSnarker Ai Haibara, aka Sherry.
* In ''[[YesPrecure5 Yes! Pretty Cure 5]]'', Coco lives in Nozomi's room at first. After an incident involving Nozomi's mother, however, the girls immediately go find him another place to live where his presence won't be as questionable.
* In ''TrampsLikeUs'', Sumire keeps a homeless young man named Takeshi, or "Momo", in her house as her "pet". To keep her boyfriend (and dog-lover) Hasumi in the dark, she has to borrow her friend's actual pet dog when Hasumi wants to see "Momo", and Takeshi pretends to be her distant cousin whenever Hasumi unexpectedly drops by.
** Hasumi later has his own Batman when Shiori Fukushima moves in, threatening to tell Sumire about the night they spent together if he kicks her out(nothing happened, but Hasumi doesn't remember that).
* A good deal of humor in ''Anime/CodeGeass'' (especially in the side stories) stems from Lelouch having to hide C.C. in his room.
* ''SonicX'' features Chuck, Chris, and their two servants hiding Sonic and his friends from the world, Eggman, and Chris's parents. At least until Eggman's land base is destroyed and the world becomes aware of their presence.
* In a ''Manga/HayateTheCombatButler'' omake, Izumi saves the title character from spending a night out in the cold (instead of Hinagiku in the main storyline), her father quickly discovers him in her room and he has to take on his alterego - Hermionie Ayasaki - to keep from suffering his wrath, and becomes the family maid for the duration. Kotetsu (the family butler and ''male'' love interest) falls in love with the alter-ego, just like in the main storyline.
* In an episode of ''Manga/CardcaptorSakura'', [[spoiler:Keroberos and Yue]] are unable to return to their alternate forms because [[spoiler:Eriol uses his magic as their creator to force them to stay in their true forms]]. Sakura struggles to address the problem that [[spoiler:a large winged panther and a winged bishounen]] are hiding out in her bedroom.
* In ''LightNovel/ACertainMagicalIndex'', Touma hides Index in his apartment, since she isn't an Academy City citizen and could be arrested or deported. She later becomes a citizen, ending the problem. The pair also hide their cat Sphynx, because the landlord doesn't allow pets.
* Parodied in ''Manga/{{Beelzebub}}'', including the excuses denizens from Hell use to insinuate themselves into unsuspecting families.
* ''{{Fractale}}'' pulls a somewhat shorter version of this.
* In the last arc of ''SoraNoWoto'', the crew hides a captured enemy soldier that they found trespassing on their border (for a harmless reason) to avoid messing the already troubled ongoing peace talks.
* Happens in several occasions in ''Manga/FullmetalAlchemist''. First when Knox accepts to treat and hide Lan Fan and May Chang after the former lost an arm and the latter escaped from the Homunculi. Later, Ed, Darius and Heinkel are sheltered for a while by shady doctors (for a price).
[[/folder]]

[[folder:Comic Books]]
* In ''ComicBook/UltimateSpiderMan'', Peter once had to hide Wolverine.
** Jean switched their minds in ''Ultimate Spider-Man'' issues 66-71[[http://en.wikipedia.org/wiki/List_of_Ultimate_Spider-Man_story_arcs#Superstars_.28.2366-71.29]] and Peter hid Wolverine in his basement in issues 34-39 of Ultimate X-Men[[http://www.amazon.com/Ultimate-X-Men-Vol-7-Blockbuster/dp/0785112197]].
* A graphic novella called ''GoodAsLily'' is about a teenaged girl who encounters three different versions of herself: as a kid, as a career woman, and as an old lady. She hides all of them in her bedroom as she tries to figure out what to do with them.
* The [[NewGods New God]] named Metron once crash landed on Earth and lost his memory. Because people in the DCUniverse are apparently extremely jaded the random little kid who saves him doesn't seem more than slightly surprised.
* [[Comicbook/GreenLantern Sodam Yat]]'s backstory has him taking care of an alien that has crash-landed on his planet, which just so happens to be ''very'' xenophobic, and stigmatizes any form of space travel[=/=]exploration.
* The original (1960s) version of DC's ''StanleyAndHisMonster'' went in for this in a big way. In addition to the monster, who was hiding from the modern equivalents of a pitchforks-and-torches-wielding mob, Stanley also ended up hiding a leprechaun and a German dwarf who didn't want to have to deal with the US immigration service, and the ghost of Napoleon, who wasn't so much hiding as haunting a grandfather clock and hoping for some decent wine. The later revamp, drawn by Phil Foglio, had only the monster, who was now a nameless demon exiled from Hell for being too nice.
* In one short story ThePunisher is found unconscious in a bayou swamp by a local woman, who tries to hide him from both the gangsters looking to kill him and her own abusive husband.
[[/folder]]


[[folder:Fan-Fiction]]
* Twilight Sparkle hides Chirp, [[spoiler:a human,]] in her library in the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' fanfiction {{Fanfic/Silent Knight}}. Cue CrowningMomentOfFunny when she buries him under a pile of books to hide him from a patron.
[[/folder]]

[[folder:Film - Animated]]
* In Pixar's ''WesternAnimation/MonstersInc'', Sully and Mike are forced to keep a human child in their apartment and later take her to work with them. They end up having an argument over her in full view of their coworkers, and take the above-mentioned play excuse UpToEleven by ''spontaneously breaking out in song''. Their deception is made even harder by the fact that if the girl screams [[spoiler: or laughs]] the circuits overload and fuses get blown.
** The play excuse goes beyond eleven in [[CreativeClosingCredits the credits]], where [[{{Defictionalization}} they actually put the show on]].
* Inverted in ''Disney/{{Tangled}}''. While Rapunzel briefly does keep Flynn hidden in a closet while Mother Gothel is around, she doesn't want to keep him a secret. She wants to use the fact that she knocked out and locked up an intruder as proof that she can handle going outside (ItMakesSenseInContext). Mother Gothel refuses to listen and never finds out.
* ''WesternAnimation/{{Planet 51}}'' looks to be an inversion of E.T, with the plot being about a human astronaut landing in a world populated by aliens and hiding out with the help of a friendly resident alien.
* Aladdin did this with Iago in ''Disney/AladdinTheReturnOfJafar'', although it was because he wanted to break Iago's HeelFaceTurn gently to the Sultan and Jasmine.
* Briefly done in ''TheIronGiant'', when the eponymous Giant comes to see Hogarth in his house. One of Hogarth's attempts to keep up the charade is a CrowningMomentOfFunny.
** Then done again later (with another CMOF) when the Giant ends up staying with Dean... and the Army comes by.
[[/folder]]

[[folder:Film - Live-Action]]
* ''Film/ETTheExtraTerrestrial'' and ''Series/{{Alf}}'' had entire families (or at least the younger set) hiding these friendly, glowy and/or cat-eating aliens.
* The ''FatAlbertMovie'' displays this trope strongly.
* The entire plot of the 1980s classic ''HidingOut'', starring TwoAndAHalfMen's Jon Cryer as an accountant who has to go on the run from the mob, or some crooked police, or something.
* In the 2007 ''Film/{{Transformers}}'' movie, Sam Witwicky is lucky his parents are clueless enough to not notice that what happened to their backyard had to have been done by someone really, really big, rather than being an earthquake.... Then again, they knew he was trying to hide ''something'', they just thought it was the girlfriend that he'd brought up into his room. The trope has been abandoned by the second movie.
* Utilized in ''TheTransporter'' where Shu Qi's character, Lai, is introduced as "The new cook" (as opposed to "the maid") to the Police inspector who is surprised at the change in Frank's (Jason Statham's) normally routine, and deceptively mundane, lifestyle.
* In ''Film/GoodByeLenin'' a young man's mother falls into a coma in East Berlin; when she wakes up, the doctor tells him that even the smallest shock might send her into a coma again. However, while she was in a coma, the Berlin Wall fell, and the Communist East Germany she knew no longer exists. Thus, the ''reunification of Germany'' becomes the Batman in his basement, as he goes to increasingly desperate lengths to make her think East Germany is still as she remembers it. [[spoiler: A different kind of inversion occurs towards the end, where the mother finds about the deception; the young man doesn't know this, and continues trying to recreate East Germany for her.]].
* In the film ''{{Volver}}'' a woman who runs a hair salon out of her house has to keep her customers from finding out that her mother, who is supposed to be dead, is living with her. She convinces them that her mother is a Russian lady who speaks no Spanish in order to forestall any awkward questions. Whenever someone who would recognize her visits, the mother hides under the bed.
* The first ''Film/{{Hellboy}}'' movie has a scene of the title character RoofHopping, when suddenly he runs into a little boy who likes to sit up there with the pigeons. They hang out and eat cookies while Hellboy throws pebbles at a perceived romantic rival on a street below them. It's one of the best moments of the movie.
* In the 1997 Disney film ''UnderWraps,'' three kids hide a reanimated mummy in the main character's bedroom. This is where his obsession with horror film memorabilia comes in handy.
* In the Soviet classic ''IvanVasilievich'', Shurik is an inventor whose TimeMachine accidentally brings Ivan the Terrible to his apartment. He is forced to hide the tsar from his wife, nosy neighbors, and the police, while he fixes the damaged machine. The twist is the tsar is a dead ringer for one of his neighbors (who is stuck in the past, impersonating the tsar), so naturally everyone assumes it's him.
* In ''Film/GameraTheBrave'', a boy named Toru hides a baby turtle from his father. Little does he know, [[spoiler: it is Gamera!]]
* [[Film/IronMan3 Iron Man in my Garage]]. Notably, Tony's in and out over the course of, apparently, a single night. Also, "Tony Stark is ''in my van!''" as said by a gigantic fan with a tattoo of him.
* Before Iron Man, ''Film/{{Thor}}'' had Jane Foster, Dr. Selvig and Darcy hiding Thor in their car dealership-turned-astrophysics lab when he fell to Earth.
* In ''Film/ACountryChristmas'', a powerless Santa must hide in a barnyard.
[[/folder]]

[[folder:Literature]]
* In Creator/RaymondBriggs' ''Literature/TheMan'', a boy must hide a tiny and very demanding man in his bedroom.
* There was a horror story in which a young girl discovers her estranged father has been [[IncredibleShrinkingMan shrunken]] and hides him in her jewelry box. She treats him like a pet until he is discovered by her mother, at which point the two of them do... [[ImAHumanitarian something really horrible]].
* The main character's family in ''[[YoungWizards Wizard's Holiday]]'' and part of ''[[YoungWizards Wizards at War]]'' is perfectly aware of the alien exchange students living in the basement, but they have to keep their existence secret from everyone else in town.
* The beginning of PiersAnthony's ''VirtualMode'' series.
* In Thomas Love Peacock's satirical novel ''NightmareAbbey'' (1818), the hero finds himself having to conceal a beautiful woman he believes to be a political refugee caught up in a web of Illuminati conspiracies [[spoiler:when she's actually just a fellow UpperClassTwit on the run from the marriage her father has arranged to ''the hero himself'']]. Their endless (thankfully offstage) conversations on Kantian philosophy don't make up for what happens when his girlfriend finds out. With a clear parody of the trope OlderThanRadio, the trope itself is probably at least as old.
* In ''TheSecretSharer'' by JoesephConrad, a ship's captain hides a stowaway in his cabin, concealing him from the rest of the crew.
* This is the plot of the novel ''TheSugarQueen.'' However, the girl in the closet turns out to be [[spoiler: the heroine's dead half-sister. Yup, a ghost.]]
* In one of the earliest ''MackBolan TheExecutioner'' novels by Don Pendleton, the protagonist is found by a "Marion the Librarian-type" after he has collapsed unconscious from his injuries following one of this raids on a Mafia target. She hides him in her house from both the police and the Mafia while she nurses him back to health and even launders his battle suit.
* Not in the basement, per se, but in ''Literature/HarryPotterAndTheChamberOfSecrets'', Harry has to keep a very noisy Dobby hidden from his aunt an uncle during a dinner party. [[spoiler:Dobby fucks it up.]]
* In a short story titled ''SuchASweetLittleGirl'', a CreepyChild has a ghost in her room. Subverted in that the girl in no way makes the ghost's presence a secret (and in fact openly brags about it), but no one in her family believes her. [[spoiler:After she sends the ghost to claw out her brother's eyes for mocking her about it, her mother ''still'' doesn't believe it. And the story ends with the implication that the mother will be attacked like the brother.]]
* In ''Literature/TheWishGiver'', [[spoiler:a girl must hide a traveling salesman she has a crush on, who is turning into a tree in her backyard after she wished that he'd "take root" in her town. During the time she tends to him, she learns that he's actually a pretty big jerk.]]
* The protagonist of ''Literature/{{Beachwalker}}'' spends most of the book hiding an escaped POW in a basement. It doesn't help that said refugee's enemies have control of most of the town.
* In ''Literature/TurnCoat'', Harry hides [[spoiler:Warden Morgan]], who is wanted by the White Council for the murder of a Senior member.
[[/folder]]

[[folder:Live Action TV]]
* In ''Series/{{Smallville}}'', ''Eternal'' and a couple episodes after it, Chloe is forced to keep [[spoiler:Doomsday]] in her basement, and [[spoiler:disposes of the bodies, which is both terrifying and tear jerking]].
* This is the basic plot of ''Series/{{Alf}}'', which is about a common family hiding an alien, and making lame excuses to avoid visitors from realizing that.
* This is the premise of Nickelodeon's sitcom ''TheJourneyOfAllenStrange'', about a brother and sister hiding a stranded teenage alien in their attic.
* An inversion in a ''Series/TheOuterLimits'' episode, two robots clone/birth a human after humanity goes extinct, and have to hide him from the other human-hating robots.
* Inverted in ''Series/BuffyTheVampireSlayer'' when Xander had to hide the villain Spike in his basement, to avoid his recapture by the Initiative. Also, in Season 7 he keeps Spike in his closet (which is fucking huge).
* Excellently done on ''Series/ArrestedDevelopment''. Michael guesses correctly that his son is hiding someone in the attic, but assumes it's his girlfriend rather than his grandfather. This leads to the following exchange when his son tries to confess:
-->'''George Michael:''' I have Pop Pop in the attic.
-->'''Michael:''' What? The mere fact that you call making love 'pop-pop' tells me you're not ready!
* Subverted in the ''Series/{{Farscape}}'' episode "I, E.T." Crichton lands on a planet that's never encountered aliens, and is caught by a young boy. He assumes this is going to be an E.T. story, and is aghast when the boy almost immediately calls for his mom. Then the two argue about what to do, with the ''adult'' wanting to hide him and the ''child'' wanting to turn him in to the military.
* ''Series/MaskedRider'': When Ferbus first arrived, Molly and Albee had to hide him due to Hal's allergies, but Hal is not allergic anymore around Ferbus; once he revealed himself, Ferbus was accepted as part of the family.
* ''Series/PowerRangersZeo'': Bulk and Skull hide an amnesiac Goldar & Rito in their basement for a while.
* In ''Series/TheNewAdventuresOfBeansBaxter'' episode "There's No Place Like Omsk," Beans hides a Russian defector, who happens to look exactly like Miss Universe Shawn Weatherly.
* In the new ''Series/DoctorWho'' series, the tenth Doctor hides ''himself'' in this manner by storing his timelord memory in a locket and tricking himself into thinking he is a Edwardian-era boarding school teacher so that the Family of Blood will not track him down and kill him in his past. His companion ends up posing as a beleaguered maid, retaining full knowledge of why her "employer" [[BadBoss has good reason to act so out of character.]]
* The first season of ''HarryAndTheHendersons'' was about an ordinary suburban family attempting to conceal a bigfoot in their home.
* In the series ''Series/{{Spellbinder}}'', there were times when Riana was hiding Paul in her barn and then, when they went through to Paul's world, times when Paul hid Riana in his house.
** In the sequel series, ''Series/{{Spellbinder}} 2: Land of the Dragon Lord'', the young Dragon Lord was hidden from invading barbarians by a local family.
[[/folder]]

[[folder:Visual Novels]]
* In ''RoseGunsDays'' Season 1, Claudia hides Leo and Rose in her house just above her restaurant, when [[spoiler:[[TheMafia Caleb and his mooks]] put a reward on their head.]] Since she left club Primavera before [[spoiler:Amanda took it over]] she can slip under their radar. [[spoiler:Until Amanda remembers about her.]]
[[/folder]]

[[folder:Webcomics]]
* In ''SluggyFreelance'', after accidentally bringing a [[ImAHumanitarian man-eating]] alien into our dimension, Torg ends up giving her a job as secretary to his web design business and letting her stay at his place. He doesn't have to put up much of a {{Masquerade}}, however, since everyone who might care about the alien in his apartment either already knows, or is gullible enough to mistake her for a lamp/party decoration/''really'' ugly woman.
* ''Webcomic/{{Misfile}}'': Ash can't exactly hide Rumisiel and Vashiel in his room given the length of the comic's run. Instead he tells his father that Rumisiel's his boyfriend and Vashiel his brother who got kicked out of the family home.
* Used in ''ComingUpViolet'' when [[CousinOliver Dawn]] crosses the proverbial pound and is forced to stay with the eponymous character and her guardian's family. Violet then deflects attempts by her friends to go to her house while the still traumatized human girl stays there. Eventually they make a disguise for her so that she can move about freely though.
[[/folder]]

[[folder:WesternAnimation]]
* The [[TropeNamer name of the trope]] comes from an episode of ''WesternAnimation/BatmanTheAnimatedSeries'', in which a boy hid an injured Batman in his mother's basement. It doesn't fit most of the rest of the trope, though, as when the kid's friend [[CassandraTruth frankly tells the mother what they're doing]], she assumes he's playing with his friends.
* In ''WesternAnimation/AmericanDad'', Stan and his family hide Roger - an alien avoiding government capture - in their attic.
** Another Episode, ''AT: The Abusive Terrestrial'', has Roger, after a short series of circumstances, starts living with another kid temporarily, similar to ET. However, the plot doesn't focus on the kid hiding him, rather on the fact the kid starts abusing Roger and Steve tries to get him to leave the little punk.
* ''WesternAnimation/TheSimpsons'': in separate episodes Bart takes in Otto (kicked out of his apartment) and Chester Lampwick, a hobo who invented Itchy & Scratchy. He keeps them both in the basement, but his parents find out fairly quickly.
--->'''Lisa''': Mom, there's a funny smell and a lot of bad language coming from the basement and dad's upstairs.
** In "The Fool Monty", Bart finds a brain-damaged Mr. Burns in the woods and takes him home, attempting to hide him in his bedroom.
* In an episode of ''WesternAnimation/UltimateSpiderMan'', Peter has to hide, of all people, the frickin' '''''[[ComicBook/IncredibleHulk Hulk]]''''' in his bedroom, in a situation similar to that of the TropeNamer. With the Hulk being the Hulk, he has a ''really'' hard time keeping Aunt May (who is right downstairs) from noticing.
[[/folder]]

[[folder:RealLife]]
* Anyone who's tried to take in a stray animal as a kid has been through this.
* All the brave people that sheltered Jews from the Nazis or runaway slaves through the Underground Railroad.
* In France, when Corsican nationalist Yvan Colona was searched for the murder of a prefect, several families hid him from the police, for several years. He has been arrested and convicted since then − although whether he really was the culprit remains unclear.
* In the late 1960s, anti-Vietnam War activist Daniel Berrigan was hidden for some months.

[[/folder]]

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