In this film SpinOff of ''Series/DaAliGShow'', Creator/SachaBaronCohen takes his Ali G character [[TheMovie to the big screen]], though this time the comedy is completely scripted.

Alistair "Ali G" Graham is a middle-class white kid from Staines, a sleepy little suburb, who lives with his grandmother. He spends his time pretending to be a gangsta with a couple other prep-school types from around the neighborhood. He has a running rivalry with the crosstown East Staines Massiv, though all the Staines gangstas are so straight-laced that they won't even exceed the speed limit while street racing. The closest thing Ali G has to a job is volunteering at the town leisure center, teaching kids how to "keep it real" by educating them on gangsta rap cliches. When he learns that the leisure center is about to be closed, he decides to go on a political campaign to keep it open. A nefarious Deputy Prime Minister persuades him to run for MP, and due to a fluke he wins. Ali G gets into a variety of FishOutOfWater shenanigans as his horn-dog, pot-smoking personality clashes with the stuffy politicos. Ultimately Ali G must rally all the suburban gangstas to save Britain from the evil Deputy Prime Minister.

The first movie based on ''Da Ali G Show'', ''Ali G Indahouse'' was later followed up by ''Film/{{Borat}}'' and ''Film/{{Bruno}}'', which gave the same big screen treatment to Kazakh journalist [[FunnyForeigner Borat Sagdiyev]] and fashion designer [[CampGay Brüno]]. Interestingly, ''Indahouse'' is Baron Cohen's only film to ditch the show's {{Mockumentary}} format entirely, incorporating a full cast of fictional characters (and quite a few recognizable actors) to prop up Ali's antics.

In addition to Baron Cohen himself, the cast includes Creator/MartinFreeman as [[HeterosexualLifePartners Ali's best friend Ricky C]], [[Film/HarryPotter Michael Gambon]] as the Prime Minister, and Creator/CharlesDance as his scheming Deputy PM.

!!This film provides examples of:
* ArtisticLicenseCars: 2 such mistakes:
** Ali's Renault 5, a car made between 1982 and 1990, has an "RE58 ECT" numberplate. This is impossible, as numberplates with "58" as the 3rd and 4th character only apply to cars first registered in late 2008 and early 2009, which, in fact, is over 4 years after the film's premiere.
*** Justified, due to a gag with a part of the "8" obscured, so that the numberplate spells [[CatchPhrase "RE5PECT"]]
** The film shows car electrical systems in models like the Volvo 940 and Vauxhall Nova as able to cause an electric shock. Such devices actually use electricity under a voltage that poses absolutely no danger to a human.
* ArtisticLicenseLaw: The East and West Staines Massivs street race legally by maintaining their speed at the exact legal limit. However, street racing is illegal even if you're not speeding.
* BestialityIsDepraved: Ali ends up winning the election because his opponent accidentally admits to performing oral sex on a horse during a televised debate.
* BigDamnMovie: The show is a {{Mockumentary}} series about Ali trying to scrape by as a talk show host, and conducting improvised interviews in amusing locales. In the movie, he gets elected to Parliament and has to fend off an evil plot to depose the Prime Minister of Britain.
* BigRedButton: Ali G tricks Parliament into thinking he'll push one that will destroy the world.
* BilingualBonus: The Spanish in the dream sequence.
* TheCameo: [[ActingForTwo Sacha Baron Cohen's]] brief cameo as [[Film/{{Borat}} Borat Sagdiyev]].
* ClusterFBomb: Ali's campaign broadcast over loudspeaker. It starts out with, ''"All you motherfuckers, fuck-fuck-fuck-fuckers!"'', and just gets more obscene from there.
* CriticalResearchFailure: [[invoked]] In-universe. Ali somehow manages to get religious conflicts in Northern Ireland mixed up with religious conflicts in Northern India, thinking that the fighting in Ireland is between "Hindus and Islams".
* DiggingYourselfDeeper: When Ali accuses his opponent of "sucking off a horse" during a televised debate. It turns out that the guy ''actually did just that'' prior to the debate, and that it was a minor scandal in his party. But instead of just telling Ali off for saying something so vulgar during a serious debate, he proceeds to try to talk his way out of it by claiming that [[NotWhatItLooksLike he just accidentally fell on the horse's phallus]], and that it was aroused because it was mating season. It doesn't go well.
* TheDogBitesBack: When Ali G has to drive a golf cart because his car is vandalized, the old guy he cut off earlier in the film steals his parking space and flips him off - with a wooden hand.
* EarlyInstallmentWeirdness: The first of Sacha Baron Cohen's films based on his three TV show characters and the only one that wasn't a mocumentary.
* EvilChancellor: The Prime Minister is actually a laid-back kind of guy who's amenable to Ali's ridiculous ideas on how to make politics "sexy" again, but the villainous Deputy Prime Minister who volunteered Ali in the first place is involved in a real estate corruption scheme.
* FishOutOfWater: Ali G in Parliament? Oh, my medication!
* GettingCrapPastTheRadar: Rico uses some pretty colorful Spanish: "Hijo su chingada madre." There's funny stuff in there too.
* IdiotHero: Well for as much as Ali G can be called a hero.
* IWasHavingSuchANiceDream: Ali G has a dream that ends with a beautiful woman performing oral sex on him. He wakes up to discover his dog licking him in an intimate place.
* HypocriticalHumor: "She's not a prostitute! She's my ho!"
* MisspellingOutLoud: Ali G hears the M.P.s arguing and stands up to tell them they should "restecp" each other more.
-->'''Ali G:''' R.E.S.T.E.C.P! Do ya even know wha it spellz?\\
'''Cabinet M.P.:''' Restecp?
* MistakenForGay: The very loud sex scene between Ali and Julie in the PM's bedroom, followed by the the DoubleEntendre-laden announcement that the PM gives downstairs about his private conversation with the president of another country.
* TheMovie: Ali G gained popularity as a television character before the film.
* PokeThePoodle: The Staines gangstas think they're pretty hardcore for flipping off cops when they can't be seen and street racing while obeying all traffic laws.
* PoliticallyIncorrectHero: Ali mistakes a feminist group for lesbians and promises to "lower taxes on strap-ons" if elected.
* PrettyFlyForAWhiteGuy: Ali G and all the other gangstas in the film are middle-class suburban kids who model themselves after what they hear in gangsta rap. Not all of them are actually white, however.
* SpringtimeForHitler: The [[BigBad Deputy Prime Minister]] plans to use Ali G as part of this sort of scheme repeatedly in order to cause a crisis of confidence and allow him to become Prime Minister: first he plans for choosing Ali G as their candidate to lose them a safe seat in a by-election, then when that fails he plots for Ali's incompetence to bring down the Prime Minister directly.
* TrailerSpoof: One teaser pretended to be for the biopic ''Film/{{Ali}}''.
* TwoWordsICantCount: A character tells people their two words: "Keep It Real!". This is of course immediately pointed out that that's ''three'' words, and [[LampshadeHanging it's followed by a debate on whether "it" counts as a word because of how short it is.]]
* YouCalledMeXItMustBeSerious: Julie only calls Ali "Alistair" when he pisses her off.