[[quoteright:305:https://static.tvtropes.org/pmwiki/pub/images/the_deadly_mantis_5.JPG]]

''The Deadly Mantis'' is a 1956 American ScienceFiction monster movie directed by Nathan Juran, one of the many films of that era concerning the mutation and animation of a [[{{Kaiju}} giant beast]], usually prehistoric.

In this case, the beast is the eponymous mantis, which is freed from beneath the Arctic ice caps by a volcanic eruption in the opening sequence and proceeds to destroy many things while progressively eating more people, until ace USAF pilot Colonel Joe Parkman (Craig Stevens) accidentally rams the mantis with his jet, forcing it to the ground and killing it. Interwoven into the story is a romantic subplot involving Parkman and magazine editor Marge Blaine (Alix Talton).

Not to be confused with the 70s [[Film/ShaolinMantis kung fu film]] which occasionally goes by ''Deadly Mantis'' in foreign releases.

For the ''Series/MysteryScienceTheater3000'' version, please go to the [[Recap/MysteryScienceTheater3000S08E04TheDeadlyMantis episode recap page]].

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!!''The Deadly Mantis'' contains the following tropes:

* TheAce: Colonel Joe. He does screw up when he loses sight of the mantis and then collides with it, but it does force the mantis to the ground.
* AllMenArePerverts: The entire Arctic base moons over moderately attractive Marge. Justified in that they've been isolated for months and they're even at a hop dancing with ''each other''.
* ArtisticLicenseBiology:
** "Every known species of animal has a bony skeleton." What?![[note]]He probably meant "animal" as a synonym for "mammal", since he mentions reptiles and birds as also having bony skeletons, so he thinks they're not whatever he means by animal. He also almost immediately contradicts himself by rattling off a series of animals that ''don't'' have bony skeletons when prompted.[[/note]]
** For the record, no, deer flies can't fly as fast as a jet.[[note]]The biologist who put this forth first published this in 1927, and it was debunked by another biologist in 1938.[[/note]]
** In addition, the mantis is constantly depicted as roaring, even though insects don't have vocal cords, throats, or even lungs.
* {{Attack Of The 50 Foot Whatever}}: Prehistoric this time, rather than [[NuclearMutant atomic]].
* BigCreepyCrawlies: The monster is a 150-foot-long insect.
* ButterflyOfDoom: Mentioned in the opening spiel as the cause for the Deadly Mantis' parole on ice -- then it is shown to be a ''volcano''.
* CassandraTruth: Marge asks Nedrick why the Pentagon wants him. He tells her that they want him to study an old bone they found in the Arctic. She thinks he's being evasive -- then finds out he was telling the truth.
* DecoyProtagonist: [[ZigZaggingTrope Zig-zagged]]; the beginning of the film follows Col. Joe as he investigates a couple of "incidents" caused by the Deadly Mantis; then the focus shifts to museum curator Nedrick Jackson, who appears to take over the lead role... right up until he, [[SatelliteLoveInterest Marge]] and Col. Joe return from the Arctic to track the big bug in New York City, at which time Col. Joe hops back into the driver's seat.
* DevelopingDoomedCharacters: Played with the twist that the monster does appear at the very beginning of the film, but there's a lot of scenes in offices later.
* DirtyCoward: One of the tribesmen abandons another who's trapped when the mantis attacks.
* {{Flight}}: Despite its large size, the mantis can fly with its wings.
* InfoDump: There are lengthy narrations about map locations and the early warning radar picket lines.
* {{Kaiju}}: The mantis is big enough to rip into the upper stories of buildings and be immune to small arms fire.
* MisplacedAccent: Why does a Canadian Air Force officer have a "Tally Ho!" British accent? [[note]]There are many Brit-accented Canadians taking after the old colonial power, but this probably wasn't what they were going for.[[/note]]
* MonsterInTheIce: The mantis starts out buried in an iceberg until a volcanic eruption causes the ice to break apart and melt, freeing it.
* SlayingMantis: The title says it all.
* StockFootage: The assembly of North American early warning radar picket lines, which ultimately have nothing to do with the plot other than to establish the location.
* StockSoundEffect: The roars of the mantis, especially the ''"MMMUROOOAAAARRROOOOOAAAAARRR"'' bellow, went on to be the roars of many giant beasts, including Bruce #4 in ''Film/JawsTheRevenge''.
* YouNeedToGetLaid: The entire Arctic base, in fact.
* YourSizeMayVary: The mantis changes from hundreds of feet long, like the established size when Parkman compares it to the C-47(around 300+ feet long compared to the 95 foot wingspan of the C-47) to less than 100 when on the Washington Monument and in the Manhattan tunnel. Promotional materials even had a drawing of the mantis holding aloft the >1000 ft long ''Queen Elizabeth II'' passenger liner in its forelimbs, which would make the beast thousands of feet long and more massive than any [[{{Franchise/Tohoverse}} Toho kaiju]].
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