[[quoteright:180:http://static.tvtropes.org/pmwiki/pub/images/dagonpriestess_7703.PNG]]
[[caption-width-right:180: [[OurMermaidsAreDifferent You don't want to see the lower half.]] ]]

A young stock market tycoon, Paul, has been plagued by strange dreams of a green-eyed mermaid. His girlfriend, Barbara, feels it is most likely an indication of excessive stress and tries to convince Paul to go on vacation with her and their older friends, Howard and Viki, to the sunny shores of Spain. Paul, however, is reluctant to go citing work, though his girlfriend won't take no for an answer and the four of them set sail in a yacht for Italy.

Everything goes fine at first. However, a sudden storm near a small fishing village named Imboca dashes the yacht against the rocks. A large rock has pierced the cabin below deck and Viki's leg is trapped between the rocks and the yacht. Luckily, the yacht is otherwise stable and in no risk of sinking. Howard stays behind to care for his injured wife while Paul and Barbara go ashore to look for help....

''Dagon'' is a 2001 horror movie loosely based on the Franchise/CthulhuMythos short story ''Literature/TheShadowOverInnsmouth'' by Creator/HPLovecraft. The film moves the action from New England to the coast of Spain, in the town of "Imboca" (which means the same as "Innsmouth"). Dagon is a highly atmospheric horror film steeped in mist and eerie themes. Despite being a modern update, many of the themes remain the same. Even if much overlooked, Dagon is worth a watch for many horror and Lovecraft fans.
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!!''Dagon'' contains examples of the following tropes:

* ApocalypticLog: The rise of Dagon.
* BarrierBustingBlow
* BilingualBonus: English and Spanish are present here.
* BloodierAndGorier: Than Lovecraft, who was a advocate of NothingIsScarier.
* BMovie
* BodyHorror: Those fish people...not all of them were born that way.
* [[spoiler: BrotherSisterIncest: between Paul and Xuia]]
* CampbellCountry
* ChildByRape: You're going to submit to Dagon whether you want to or not.
* CosmicHorrorStory: By association with the CthulhuMythos.
* CruelAndUnusualDeath: Surprisingly frequent. A few couple include [[spoiler: being skinned alive to make ceremonial masks and suicide by pocket knife Hara-kiri style]].
* CthulhuMythos
* DownerEnding: [[spoiler: TheBadGuyWins. Our hero goes from RoaringRampageOfRevenge to DrivenToSuicide to AndThenJohnWasAZombie in the course of two minutes.]]
* DrivenToSuicide: But even that doesn't work out.
* EldritchAbomination: Dagon itself.
* ExtremelyDustyHome: As a citywide phenomenon.
* {{Fanservice}}
* FishPeople: Some of them have cephalopod traits as well.
* FlayingAlive.
* GhostCity: Imboca [[spoiler: At least at first...]].
* {{Gorn}}
* HellHotel: Barbara picked a great place to look for help.
** As Paul discovers, it comes complete with a DisgustingPublicToilet, smashed windows, and a bed in which someone--or some''thing''--has apparently died recently.
* HorrorFilms
* HumanSacrifice: [[spoiler: Viki and Barbara. Barbara gets more ceremony, though]].
* KillItWithFire: Paul goes with an old standby at the finale.
* LovecraftOnFilm: An adaptation of ''Literature/TheShadowOverInnsmouth'', with some elements of "Literature/{{Dagon}}".
* [[spoiler: LukeIAmYourFather: said by one of the fish people to [[HumanoidAbomination Paul]]]]
* MalevolentMaskedMen: wearing human faces no less.
* ManOnFire: Merman, too.
* TheMermaidProblem: Averted via tentacles with certain *ahem* functions.
* MonsterProgenitor: Dagon
* MoodWhiplash: The slow pacing and dramatic mood of the film is interrupted by a flashback to a surprisingly dramatic depiction of the town's corruption by inhuman forces.
* NightmareFace
* OminousFog
* OnlySaneMan: The old drunk Ezequiel; though he admits to being crazy in his own way as well.
* OurMermaidsAreDifferent: Really, "mermaids" here are just another slight anatomical variation on Fish People.
* RoaringRampageOfRevenge: Paul isn't stingy with that kerosene.
* ReligionOfEvil: The cult of the fish god, Dagon.
* SceneryGorn: Also the city of Imboca with it's flooded houses, caving in roofs, and broken windows everywhere.
* ShownTheirWork: The movie is actually almost completely faithful to Lovecraft's themes and stories. The director and producer also did extensive research on comparative religion, which shows in the design work regarding the various implements and decorative items the cult uses.
* SinisterMinister: The town's priest.
* SinisterScrapingSound: More like thump, shuffle and scrape.
* TomatoInTheMirror: [[spoiler:Paul is half Deep One.]]
* TownWithADarkSecret
* UnscaledMerfolk: They're more cephalopod than traditional merfolk or FishPeople.
* VerbalTic: "There are two possibilities..." for Paul. Eventually it changes to [[spoiler: "No possibilities," when he tries to kill himself to avoid becoming the lover of his sister Xuia the Dagon high priestess]]
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