'''''Reptilicus''''' is a 1961 Danish {{Kaiju}} movie, in the vein of ''Franchise/{{Godzilla}}''. It is notable for being the first and only Danish Kaiju film. A Danish-American co-production, an English-speaking version was filmed simultaneously with the Danish one, which led to the frequent misunderstanding that the two versions are the same except for language, but in practice there are quite a few differences between the two versions, as the two projects each had their own separate director attached and a couple of differences in cast. Notably, the American version also went through a somewhat heavier post-production and editing process than its Danish counterpart, [[ExecutiveMeddling due to demands from studio executives]], resulting in it first getting released in 1962.

A section of a giant reptile's tail is found by a Danish mining company in the frozen grounds in Lapland. The section is flown to the Danish Aquarium in Copenhagen, where it is preserved in a cold room for scientific study. But due to careless mishandling, the room is left open and the section begins to thaw, only for scientists to find that it is starting to regenerate. Eventually having grown back to its full size, the monster goes on an unstoppable rampage from the Danish countryside to the panic-stricken streets of Copenhagen.

Had a short lived adaptation from CharltonComics, but because they bought the film rights from the American distributor and not the Danish creators, they had to drop the title after issue 2. The story continued, however as ''Reptisaurus''.

Modern kaiju fans will be able to watch this as it is confirmed to be one of the movies chosen for Website/{{Netflix}}'s revival of the popular movie-riffing series ''Series/MysteryScienceTheater3000''.

* AntagonistTitle
* [[CoversAlwaysLie Movie Posters Always Lie]]: The poster art for this movie showed a gigantic draconic monster ripping San Francisco apart, destroying the Golden Gate Bridge, and laying waste to US Navy ships. This was more exciting than anything in the actual movie itself.
* FromASingleCell: The whole of Reptilicus regenerates from its tail.
* HealingFactor. Ridiculous amounts of it.
* HollywoodAcid: The monster's main weapon, in the U.S. cut, aside from being a giant lizard of doom.
* LargeHam: Mikkelson
* {{Novelization}}: Written by Dean Owen, who also did the novelization for ''{{Film/Konga}}''. Owen adds in numerous sex scenes between the characters to spice things up.
* NeverRecycleYourSchemes: The army learns in their first battle that Reptilicus is pretty vulnerable to fire. Yet in their second attack, they find excuses not to use flamethrowers again.
* PsychoElectricEel: Played for laughs.
* SameLanguageDub: The film was shot with the cast phonetically speaking their lines in English to make it easier to sell in America, but the cast's thick accents forced its American distributors to re-dub the entire film.
* ThatRemindsMeOfASong: Dirch Passer's character, Mikkelsen, gets a completely unmotivated and random comedic song number featuring a children's choir in the chorus, in the middle of the film, apparently solely because the producers thought the film needed a bit of musical relief.
* TechnicolorScience: That's a rather interesting laboratory in the Akvarium.
* TheEndOrIsIt: Yay! The army [[spoiler: made Reptilicus swallow a poison missile]], and now it's dead! Denmark can now go back to normal life! [[spoiler: Except that the piece of Reptilicus severed by a depth charge is now twitching...]]