[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/planet51_copyright_ilion_an.jpg]]

->''"General, I know what you're afraid of, and it's not Chuck. It's not monsters or aliens. It's the unknown. I've spent my whole life running from it, and I think maybe you have too, but I'm telling you the unknown isn't something to be afraid of. It can be your best friend. And just when you think that it means the end of everything you know, it's really just the beginning."''
-->-- '''Lem''', to General Grawl

''Planet 51'', a Spanish/American AllCGICartoon feature from 2009, is an AffectionateParody of tropes from both ScienceFiction and {{Sit Com}}s of TheFifties.

The premise: Human astronaut Captain Charles "Chuck" Baker, accompanied by an exploration robot named Rover, lands on the eponymous planet, which is supposedly uninhabited. However, Planet 51 ''is'' populated, by green-skinned humanoids whose world strongly resembles 1950s suburban America. The aliens are also paranoid about being invaded by another planet, so Chuck's appearance causes unintentional havoc, and he's soon being hunted by the military. Chuck befriends an alien teenager named Lem, a worker at a local observatory; Lem protects the astronaut as he struggles to return to his ship, which will automatically take off after a preset time limit whether Chuck is aboard or not.
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!!Tropes:
* AffectionateParody
* AlienInvasion: Subverted by the "invasion" being an accident. Also Inverted as Humans are the "invaders".
* AliensSpeakingEnglish: [[LampshadeHanging "Hey, you speak my language!"]]
* AllAnimalsAreDogs: The aliens keep doglike [[Franchise/{{Alien}} xenomorphs]] as pets.
** Rover acts like one too. Complete with wagging his antenna and sniffing with his main lens.
* AllCGICartoon
* AllPlanetsAreEarthlike
* ArtisticLicenseAstronomy: An InUniverse example. According to Lem's observatory lecture at the beginning of the film, "the universe is nearly 500 miles long, and it contains--you're not going to believe this--over 1000 stars!"
** This is apparently a running thing with the aliens' unit measurements - they seem to just use lower numbers for things in general: at one point the professor postulates that a manned space flight would cost "hundreds of dollars."
** Actually, it's all probably deliberate considering just how little the aliens actually know about space. They haven't even been able to launch satellites into orbit yet.
** Another example of ArtisticLicenseAstronomy, not to mention SciFiWritersHaveNoSenseOfScale: at one point Chuck mentions the alien planet is 20 billion miles away from Earth. In RealLife, the nearest star to our solar system is 24.7 ''trillion'' miles away.
*** Possibly FridgeBrilliance: he mentions at some point that the only thing he does with the star ship is to push some buttons, like a monkey could do. Chuck isn't exactly the brightest bulb of the set...
* [[BarefootCartoonAnimal Barefoot Cartoon Aliens]]: Apparently, the aliens DoNotLikeShoes.
** TertiarySexualCharacteristics: The female aliens have built-in, organic "high heels" on their feet. WordOfGod (aka character designer Ignacio GŁejes, in the book ''The Art of Planet 51'') explains that this is because "we discovered that if the females had that extra heel on their feet, they would move differently than the male aliens, with swaying hips."
** [[HalfDressedCartoonAnimal Half Dressed Cartoon Alien]]: The male aliens don't wear pants, either, in a variation on PantslessMalesFullyDressedFemales.
* BatmanInMyBasement: Lem hiding Chuck.
* BigDamnHeroes: There are several scenes like this as the movie nears its climax.
* BizarreAlienBiology: Several examples, all PlayedForLaughs.
** According to [[AllThereInTheManual the official website]], the aliens' hearts are located behind the left kneecap, and their blood is green.
** The aliens can function without [[spoiler: a brain]], and might even be ''smarter'' that way. Which just leads to the question of why they think it's important, but...
** As Lem and Skiff are trying to keep Chuck hidden, Skiff reveals very strange assumptions about toiletry needs.
--> "If you have to go number one, aim for the newspaper. If you have to go number two, go outside. If you have to go number three, I can't help you."
** That last thing ''may'' be [[GettingCrapPastTheRadar a reference to]] ADateWithRosiePalms.
*** ''This troper'' assumed diarrhea or vomit, which "number three" is most often intended.
** Also their hair looks like it's a living part of their bodies, and lots of fanfics call it "feelers". How do they cut it?
* BowelBreakingBricks: General Grawl intimidates Rover during interrogation, giving the robot a sudden oil leak. DoesThisRemindYouOfAnything
* ABoyAndHisX: [[spoiler:Skiff eventually adopts Rover as a pet.]]
** [[spoiler:And the xenomorph "dog" stows away with Chuck as he departs.]]
* BrainInAJar: Professor Kipple has a few in his lab.
* CallASmeerpARabbit: The aliens call their pet [[Franchise/{{Alien}} xenomorphs]] "dogs."
* CannotSpitItOut: Lem has a hard time asking Neera out on a date. This is partially due to his own shyness, and partially because Glar is a MomentKiller who bursts into song whenever Lem is about to ask Neera out. [[spoiler:Technically, Lem never completes his question to Neera, because at the end of the film she says "yes" before he can finish, and gives him a ShutUpKiss.]]
* CityOfAdventure: Glipforg, the quiet little suburb where Chuck lands.
* CloudCuckoolander: Skiff, a sci-fi {{nerd}} who takes aliens a little ''too'' seriously, even before one of them arrives.
* DevelopingDoomedCharacters: Reversed, most likely for parody.
* ElaborateUndergroundBase: Base 9.
* {{Expy}}: The Aliens' pets look like [[Franchise/{{Alien}} Xenomorphs]] that are about the size of a toy poodle. They have a sucker mouth on a frog-tongue, instead of a second set of jaws, though.
** They don't bleed acid, though. They ''piss'' acid.
* FailedASpotCheck: Chuck manages to walk several feet without noticing the aliens or their entire town, until he steps on a squeaky toy and turns around.
* FictionalPinballGame: There are several alien pinball games in the bowling alley.
* TheFifties: Parodied by the culture of the aliens.
** More like the [[RecycledINSPACE SPACE-Fifties!]]
* FourFingeredHands: The aliens have them. [[{{Lampshaded}} "Gimme four!"]]
** Chuck actually has five fingers.
* GeneralRipper[=/=]InspectorJavert[=/=]WellIntentionedExtremist: General Grawl, leader of the soldiers hunting Chuck, is a combination of all of these tropes.
* GreenSkinnedSpaceBabe: Judging from Chuck's reactions to the alien women in the commercials.
* GenreSavvy: [[WrongGenreSavvy for all that he thinks Chuck is there to invade Planet 51]], General Grawl does realize that such an effort would be carried out by the military, whose members would carry something that points out towards their origin. [[spoiler:This allows him to find Chuck in the middle of a crowd disguised in similar disguises, as Chuck's is the only one that has an US flag patch.]]
* GroinAttack: Implied, when the astronaut lands on a globe.
* HassleFreeHotwire: Chuck and Lem both do this. Lem {{lampshades}} it by explaining to Neera that hotwiring is "how they start cars on Earth."
* HeelFaceTurn: [[spoiler:General Grawl does one after Chuck saves his life.]]
* HiddenInPlainSight[=/=]StatusQuoIsGod: How do you hide an alien astronaut? Paint an eyeball on his space suit and enter him in a costume contest promoting the AlienInvasion movie that just happens to be premiering today. Double for Status Quo because even though the "invasion" has the military in a tizzy, the movie premiere isn't even delayed!
* HoistByHisOwnPetard: [[MadScientist Professor Kipple]] extracts the brains of the soldiers that have been tricked by Chuck into believing they have been brainwashed. At the end of the film, the two soldiers practice the same operation on the Professor.
* HumansThroughAlienEyes: The premise of the film.
* InhumanableAlienRights: Subverted, since Chuck is the one who might be victimized.
** Inverted only from a human perspective. It may very well be played straight, since technically Chuck is an "alien" while on the planet.
* InnocentAliens: Both Chuck and the aliens.
* {{Keet}}: Eckle, a little boy who's positively enthusiastic about the prospect of invasion by brain-eating aliens.
* LoveTriangle: Lem and Glar are both interested in Neera.
* ManiacalLaugh: Professor Kipple has one.
* MadScientist: Professor Kipple, who wants to remove and study Chuck's brain. [[spoiler:And he's refined the procedure through [[MoralEventHorizon practicing ON HIS OWN KIND]].]]
* MindControl: The aliens believe that Chuck can do this. After all, isn't he an alien invader?
* MisplacedAccent: in the European Spanish dub, the [[spoiler: brainless]] aliens speak with Argentinian accents.
* NeedleInAStackOfNeedles: how Chuck manages to hide while he tries to reach his ship (see HiddenInPlainSight).
* OnlyOneName: The aliens.
* [[spoiler:OutOfTheInferno: How Chuck saves Grawl as Base 9 is self-destructing.]]
* PerspectiveFlip: A human astronaut is seen as an alien invader by most of the locals, with a few realizing that he is actually a peaceful visitor.
* PoliceBrutality: Glar gets beaten up by soldiers as a [[WeNeedADistraction distraction]] so that his pals can sneak into Base 9. It's PlayedForLaughs, and Glar himself seems okay with it.
* ProductPlacement: At one point Chuck pulls a Twix bar out to convince Lem to clear the way to his ship. [[note]]It's not actually uncommon for any kind of explorer to take a supply of chocolate with them, because its high callorie count allows an average person to keep their hunger in check even in small quantities (no matter if it's an M&M's packet or a Toblerone bar), and it also takes a long time to rot (it may melt depending on circumstances, but that doesn't render it inedible).[[/note]] Professor Kipple later finds the discarded wrapping and interprets it as being a death threat in alien language (while the barcode would be the surrender terms).
** There's also a Volkswagen badge on the front of Glar's van.
* ProtestSong: Glar specializes in them.
* RaceAgainstTheClock: Chuck's ship is programmed to leave in 74 hours--with or without him. [[spoiler:He makes it.]]
* RidiculouslyCuteCritter: Rover is one of the cutest robots ever.
* RobotBuddy[=/=]TeamPet: Rover is a little of both.
* RuleOfFunny: How likely is it that an alien civilization which has had little contact with Earth (and even that hasn't been revealed to the public) would evolve into a near-perfect duplicate of a specific human culture? How likely is it that such a world would have a popular science fiction franchise called ''Humaniacs''? And how likely would it be that they have developed a perfect copy of the English language? Who cares?
* SceneryPorn: The film's backgrounds are just breathtaking.
* SciFiWritersHaveNoSenseOfScale: Parodied. No one can take seriously anyone who would even remotely suggest that the Universe was only 500 miles wide, since the planet they were on has to be much bigger than that in order to have an atmosphere capable of sustaining life, and a typical star is at least three orders of magnitude larger than 500 miles.
* {{Sequelitis}}: Parodied InUniverse by ''Humaniacs III'', a [[ShowWithinAShow movie within the movie]] that happens to be opening when Chuck lands. The franchise is about alien invaders, of course.
* ShoutOut:
** [[Franchise/{{Alien}} A pet "dog" is named Ripley]].
** [[Film/ETTheExtraTerrestrial Chuck's bike ride]].
** [[Franchise/{{Terminator}} Chuck's televised]] [[Franchise/StarWars alien roleplaying]].
** Eckle hums a snippet of [[Franchise/StarWars "The Imperial March"]].
** [[Film/SinginInTheRain Rover's dance]].
** The Tea Party cafe was called [[Film/TheDayTheEarthStoodStill1951 Nikto's]].
** The fact the main alien character's name is the last name of [[Creator/StanislawLem a known SF writer]] probably also counts.
*** Either that, or an acronym for Lunar Excursion Module. Or ''both''.
** Sounds from ''Film/WarGames''.
** Chuck as Chuck Yeager.
** [[Film/TwoThousandOneASpaceOdyssey HAL 9000]] camera eye.
** When Humaniacs III's poster goes up, two of the cast make ''Franchise/StarWars'' noises and reference ''Star Wars'' plots while talking about it.
** "I was supose to plant Old Glory, head back to the Kids Choice Awards...I was supposed to get slimed!"
** "Listen Kid...you are a kid, right? you're not like a thousand year old [[Franchise/StarWars Yoda]]?"
*** "This is totally Luke Skywalker!"
** One of the aliens' contingency plans is for [[Film/AttackOfThe50FootWoman an attack by a 50-foot woman]].
** The planet's {{Area 51}} is called "Base ''[[Film/Plan9FromOuterSpace 9]]''".
* TheSmurfettePrinciple: Neera is the only female character with a substantial role.
* SitcomArchNemesis: Lem seems to see Glar as an antagonistic competitor, only because Neera seems interested in him; in actuality, Glar's been on his side the whole time.
* SoundtrackDissonance: The advertisement for the film uses Music/TheKillers' "Spaceman." The song is about being abducted by aliens and then being autopsied.
* SpaceRomans: In this case, Space Suburbanites.
* StealthPun: Chuck's [=MP3=] player has a picture of a pot as its logo, making it, presumably, an [=iPot=].
* SuspiciouslySpecificDenial: Right after Chuck is captured:
--> '''General Grawl:''' Let's take the aliens to Base 9[[note]]Their equivalent to {{Area 51}}[[/note]]!
--> ''(crowd gasps)''
--> '''General Grawl:''' ...Not that it exists.
* TerrorAtMakeoutPoint
* ToiletHumor: You'd better believe it.
* WhoEvenNeedsABrain: Once two alien soldiers have their brains removed not only do they still function but actually seem to get ''smarter'' such as speaking in SesquipedalianLoquaciousness.
* WrongGenreSavvy: most of Planet 51's inhabitants think that Chuck will behave like the "human" monsters in their films, but actually the poor guy was only exploring.
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