->''"But why did you join the Organization in the first place? When you joined that you accepted National Socialism, and you accepted every method it employs to achieve its aims."''

An AlternateHistory film set in a [[UsefulNotes/WorldWarII Nazi-occupied Britain]], that explores the moral slippery slope leading to collaboration.

In 1944 the village of Shaftesbury is evacuated as part of a German crackdown on partisan activity in the area. Pauline, an apolitical Irish nurse, is accidentally left behind with several of her friends, all of whom are killed in a Resistance ambush. On reaching London Pauline finds nursing jobs are controlled by the paramilitary Immediate Action Organization, which she is reluctant to join. She changes her mind after witnessing the Organization efficiently putting down a brawl in which an IAO officer is brutally assaulted. Pauline has no interest in fascist ideals, but thinks [[ResistanceIsFutile resistance to the occupation is only making things worse]] and Britain should get back on its feet. Unfortunately she discovers that [[JumpingOffTheSlipperySlope separating herself from the more reprehensible actions of fascism]] is not so easy in practice.

The concept of the film was first developed in 1956 by eighteen year-old Kevin Brownlow, and was eight years in the making -- the longest ever production schedule to date according to the Guinness Book of World Records. It had a cast of hundreds; all volunteers with only two professional actors among them. While trying to find [=WW2=] uniforms for the film Brownlow met sixteen-year old history buff Andrew Mollo, and the two decided to work together on the project. Brownlow would later become a prominent film historian and Mollo a leading military historian. ''It Happened Here'' also launched the career of cinematographer Peter Suschitzky, who went on to such films as ''Film/TheRockyHorrorPictureShow'' and ''Film/TheEmpireStrikesBack''.

!!''It Happened Here'' contains the following tropes:

* AlternateHistory: An opening narration explains that Britain was invaded in July 1940, with a nascent Resistance quickly crushed without outside support. The film is set four years later -- the United States has entered the war and is supporting a resurgent partisan movement with carrier-based aircraft. Most German troops have been shifted to the Russian front to combat a Soviet breakthrough in the Urals, leaving the occupation of Britain to a token force, including volunteers from the British Legion of SS.
* AsHimself: [[http://en.wikipedia.org/wiki/Colin_Jordan Colin Jordan]] and other [[BlackShirt British fascists]] played members of the IAO.
* BritishNazis: For once justified. There are even actual British Nazis!
* LesCollaborateurs: The film subverts the popular view that only self-serving opportunists and power-hungry fanatics would work with an invading force.
* DayOfTheJackboot
* HeWhoFightsMonsters
-->'''Dr. Fletcher:''' "The appalling thing about fascism is that you've got to use fascist methods to get rid of it. We've all got a bit of it in us, and it doesn't take a lot to bring it to the surface."
* LiteraryAllusionTitle: ''Literature/ItCantHappenHere'' a 1935 novel by Sinclair Lewis about a totalitarian government taking over the United States.
* MoralMyopia: A female IAO Commandant reprimands Pauline for not showing "loyalty to the English people" (e.g. failing to denounce her friends). Also the IAO Political Leader at a funeral for a BlackShirt:
-->"This rabble, this Jewish pirate scum, HAVE MURDERED OUR COMRADE!"
** Even more appalling when you realize that Colin Jordan, the man playing him, was a ''real'' British fascist.
* NewscasterCameo: Veteran wartime [[Creator/TheBBC BBC]] radio announcers Alvar Lidell and John Snagge gave their services free to voice reconstructed {{newsreel}}s and radio broadcasts.
* PropagandaMachine: A newsreel gives a revisionist history of British/German relations, ending with British and German soldiers having a snowball fight on the Russian front.
* RareVehicles: Actual vehicles, uniforms and weapons from the era were used, all donated by various collectors.
* ReassignedToAntarctica: Pauline is demoted and sent to the countryside, a move she initially welcomes as the country hospital has none of the fascist paramilitary trappings of the ambulance corps. [[spoiler:She then discovers the hospital is being used to euthanize foreign slave workers who have contracted TB.]] Also seen when a 'friend' tries to denounce Pauline for secretly trying to get some morphine. Fortunately her superior has just received a phone call announcing his reassignment to somewhere unpleasant (presumably the Russian front) and throws her out of his office.
* ReleasedToElsewhere
* LaResistance: Subverted. The British civilians in Shaftesbury are clearly more afraid of the partisans than they are of their German occupiers.
* {{Retraux}}: Hand-held cameras, grainy footage and quick cuts were used for the newsreel, with no stock footage whatsoever being used.
* TheReveal: When Pauline learns the unpleasant truth about her new hospital.
* TheRevolutionWillNotBeCivilized: At the beginning of the movie, the SS are shown massacring civilians found in a restricted area. [[BookEnds At the end of the movie]] the Resistance [[NoQuarter gun down unarmed prisoners]] from the British Legion of SS.
* ShownTheirWork: On one occasion a group of [[UsefulNotes/WeAreNotTheWehrmacht Bundeswehr]] tank officers training in Britain were surprised to see German [=WW2=] soldiers marching through Parliament Square; they inspected the troops and pronounced them "absolutely correct".
* StateSec: The Immediate Action Organization, which is an entirely British group belonging to the SS.
* TrainingMontage: Used to show not only Pauline being taught new skills by the IAO, but also how she is being indoctrinated. At the beginning the nurses flinch when firing a Webley revolver; by the end of the montage all of them are shown coldly blazing away at their targets.
* TalkingHeads: Pauline's co-workers [[spoiler:justifying their involvement in the euthanasia program.]]
* TheUnreveal: The final scene is of Pauline treating the Allied wounded after her capture, while the distant rattle of machine-gun fire is heard as the SS prisoners are massacred. We never discover her fate.
* VillainsOutShopping: A montage shows German soldiers playing tourist in London, mixing with the locals and chatting up girls.