History WesternAnimation / HowToTrainYourDragonTheHiddenWorld

* CallBack: Hiccup makes Toothless an automatic tail fin so he can fly on his own which makes Astrid reference "Gift of the Night Fury", questioning that he made Toothless one before and he didn't want it then. Hiccup answers that Toothless didn't have a reason at that time, but he does now; he wants to follow and court the Light Fury.

* HeadbuttOfLove: [[spoiler:Hiccup and Astrid.]]

The film is to be followed up with a second Dragons Holiday special following the events of the film's DistantFinale titled ''WesternAnimation/HowToTrainYourDragonHomecoming''.

* MatingDance: The Light Fury initiates one with Toothless, who makes a complete mess of himself. [[spoiler:They eventually meet in the middle and combine both their courtship approaches into an exchange of prancing and gurgling.]]

** Drago Bludvist's army is a driving force in the film and still significantly large in number. The army is now commanded by several Warlords. Just because their leader is gone, doesn't mean there aren't other people with authority who wanted the same goal.

* SecretKeeper: It's quite possible that Hiccup and Astrid never told any of their companions where the Hidden World was. [[spoiler: They are the only ones that return to its entrance years later with their children.]]

* ScaryImpracticalArmor: While this is generally averted in that most of the riders now have flight suits that are quite practical and protect them from fire and make them look intimidating while on missions, Snotlout’s is the only one that is made more useless by it. His BadassCape repeatedly [[CapeSnag snags]] whenever he tries to make a ThreePointLanding and his helmet done in Hookfang's likeness has a bad habit of being knocked at an angle, leaving him blind during fights.

** The above trailer and a December 2018 ad for the film shows brief clips of an emotional scene where Hiccup [[spoiler:pets and holds Toothless while he's crying]], which is very obviously the seen where [[spoiler:they say goodbye]].

** The above trailer and a December 2018 ad for the film shows brief clips of an emotional scene where Hiccup [[spoiler:pets and holds Toothless while he's crying]], strongly suggesting it may be the scene where [[spoiler:they say goodbye]].

--> '''Snotlout''': (''to Hiccup'') [[TooSoon Who died and made you chief?]]

* CallBack:
** Hiccup makes Toothless an automatic tail fin so he can fly on his own which makes Astrid reference "Gift of the Night Fury", questioning that he made Toothless one before and he didn't want it then. Hiccup answers that Toothless didn't have a reason at that time, but he does now; he wants to follow and court the Light Fury.
** After Hiccup and his gang bring a Crimson Goregutter on the island, it begins to play with a baby Gronckle Fishlegs is taking care of and accidentally knocks over some pole, producing DisasterDominoes knocking over few buildings, just like at the beginning of the first movie after Hiccup shoots down Toothless.
** The Light Fury's [[spoiler: rescue of Hiccup is framed in exactly the same way as Toothless's rescue of Astrid in the first movie was: the human is tumbling through the air, gets caught, and then looks up to see the dragon ducking its head down to smile at them]].
** While being held prisoner by Grimmel, Ruffnut references her crush on Eret in the second movie (saying that that ship has sailed and she's over him now), and also mentions Fishlegs and Snotlout fighting over her while expressing her misgivings about both of them.
** [[spoiler: Hiccup kills Grimmel in a similar manner to how he tried to kill Krogan during their first encounter (i.e. untying his prosthetic leg).]]
** In the epilogue [[spoiler:Astrid rushes past Hiccup on Stormfly and looks back, silently challenging him to a race. It's the same interaction they had at the end of the second film, and Hiccup even gives his son a look as if to say: "some things never change."]]

* BadassBeard:
** Tuffnut ''wants'' to grow one, but since he can't, he settles for tying his braids to mimic a beard and then constantly boasting of it.
** Hiccup grows a ''spectacular'' one for the epilogue, complete with an equally awesome BadassCape to boot.

* TheCameo: [[spoiler:Drago's Bewilderbeast]] appears in the hidden world for a few seconds.

* DemotedToExtra:
** Eret gets hit by this hard in the movie, to the point his screentime is reduced to a couple of minutes at most.
** Berk itself could be considered this, considering [[spoiler:it is abandoned after the first thirty minutes of the movie and it is never referenced again.]]

* DragonInChief: Grimmel may have been brought in by what was left of Drago's army to deal with Hiccup and Toothless, but he's clearly the bigger threat.

* {{Foil}}: Just as Drago was a foil to Hiccup in the last film, Grimmel the Grisly is another one; he not only controls dragons using drugs (specifically venom taken from one of the dragon species he controls) but Grimmel actually copied Hiccup's feat of shooting down a Night Fury when he was a child, except that Grimmel freely killed that dragon and all other Night Furies he could find where Hiccup was inspired to bond with the dragon and became a dedicated protector of all dragons.

* GreaterScopeVillain: It has been implied many times throughout the series that Toothless is the LastOfHisKind. Grimmel is the man responsible for that.

* NoNameGiven: To emphasize the Light Fury's wild nature, the crew deliberately avoided giving her a name.

* PosthumousCharacter: After being killed in the second film, Stoick appears through flashbacks to Hiccup's childhood.

* FemaleFelineMaleMutt: Behaviorwise, Toothless has always been an amalgamation of various animals, with dog and cat featuring in more or less equal measures. The Light Fury, however, is basically all cat.

* IWantMyBelovedToBeHappy: [[spoiler: Hiccup comes to the platonic version of this with Toothless. When Toothless successfully woos the Light Fury and is taken to the Hidden World, Hiccup becomes restlessly worried when he does not come back. When he, Astrid and Stormfly find him, seeing that he is perfectly at home in the Hidden World with the Light Fury, he mournfully realizes that he would be happier there than he would be with him and decides to leave. He tells Toothless that he should go back when he brings them back to New Berk, and after they successfully defeat Grimmel and the warlords, Hiccup says his goodbyes to Toothless, knowing that he and the other dragons would be safer there than with him and his tribe.]]

* MyGodWhatHaveIDone: [[spoiler: Hiccup's clearly feeling some shades of this during and shortly after landing from the flight from the Hidden World. It's not just the fact that he found out the Hidden World is not a viable option for Berk or any of its humans... but the flashback with Stoick also makes it clear how much he values love and relationships... and he just forced Toothless to get him out of a very dangerous spot, separating the dragon from the one he loves. He does brighten up though when he realizes the Light Fury followed them home.]]

* RidingIntoTheSunset: [[spoiler: Much like the first movie, ''The Hidden World'' ends with Hiccup and Toothless flying off into the sky towards the sun. [[BabiesEverAfter This time, however, they are joined by their respective significant others and offspring]] ([[MyFriendsAndZoidberg and also Stormfly]]).]]

* TheWorldIsNotReady: [[spoiler: In the end, the dragons retreat to the Hidden World until the rest of humanity is ready to live in harmony with them]].

* DistantEpilogue: [[spoiler: The epilogue takes place nine years after the main narrative, with a now married, 30-year-old Astrid and Hiccup bringing their two young children to meet Toothless]].

* WeHaveBecomeComplacent: One of the {{Central Theme}}s of the film. Hiccup and his friends have become too dependent on their dragons, so when they face an OutsideContextProblem that dragons cannot or are not available to solve, they become less competent. The crux of the film is Hiccup and friends learning to stand on their own, [[spoiler:which allows them to deal with parting ways with their dragons so they can go live in peace in the Hidden World.]]

** [[spoiler: The epilogue takes place nine years after the main narrative, with a now married, 30 year-old Astrid and Hiccup bringing their two young children to meet Toothless]].

* SoMuchForStealth: Hiccup's mission in the opening was supposed to be a stealth mission, but the others end up messing things up. {{Lampshaded}} by Astrid.

* BittersweetEnding: [[spoiler: Though the village and the dragons are saved from Grimmel and are still thriving, until the rest of the world is ready to live in harmony with them, the dragons retreat to live in the Hidden World, and fade into myth. Years later, when both have families of their own, Hiccup and Toothless reunite.]]

* OffIntoTheDistanceEnding: [[spoiler: Much like the first movie, ''The Hidden World'' ends with Hiccup and Toothless flying off into the sky. [[BabiesEverAfter This time, however, they are joined by their respective significant others and offspring]] ([[MyFriendsAndZoidberg and also Stormfly]]).]]

* NoSell: Hiccup and the gang now wear fireproof armor made from dragon scales, which leads to them being mistaken for demons due to them being able to walk through fire. [[spoiler: Later, Toothless' autonomous prosthetic fin gets the same treatment.]]

* OutOfTheInferno: Hiccup and Toothless walk through a blazing fire side-by-side with no signs of flinching.

** Toothless's doglike mannerisms are much more pronounced here, and his snark and intelligence are far less prominent. Hiccup even occasionally speaks to him in a baby voice, the way people often do when speaking to their pets -- something he rarely did in previous films.

* FlauntingYourFleets: In the trailer, Grimmel is shown to have command over a massive armada of ships (the insignia on the ships' sails led to the assumptions that he took over Drago Bludvist's fleet following the latter's defeat in the second film). The movie reveals that the fleet isn't really his. Drago's lieutenants are in charge and are simply working with Grimmel to get their hands on the dragons.

* GrandFinale: This is the final film of the ''How to Train Your Dragon'' trilogy, as well as (presumably) the franchise as a whole.

** Then there is a moment with [[spoiler:Hiccup and Astrid openly flirting while battling on a ship with Astrid throwing one of Hiccup's gas cylinders at some Mooks, followed by Hiccup throwing his flaming sword that causes a huge ball of fire to ignite in the background while the two gaze lovingly at each other.]]

* YouAreBetterThanYouThinkYouAre: One of the {{Central Theme}}s of the film. Hiccup and his friends have become too dependent on their dragons, so when they face an OutsideContextProblem that dragons cannot or are not available to solve, [[WeHaveBecomeComplacent they become less competent.]] The crux of the film is Hiccup and friends learning to stand on their own, [[spoiler:which allows them to deal with parting ways with their dragons so they can go live in peace in the Hidden World.]]

* UnflinchingWalk: Hiccup and Toothless at the very beginning of the movie, strolling through the flames of a burning enemy ship, with Hiccup brandishing [[FlamingSword Inferno]].

* PityTheKidnapper: Invoked by Ruffnut as she annoys Grimmel with her incessant talking (including her annoying twin brother, her love life, and her hair braids) until he snaps, releases her, gives her a dragon fledgling to ride and tells her to just get out. Tuffnut even says he feels sorry for the kidnappers who got stuck with her. [[spoiler:Unfortunately, she's not nearly as clever as she thinks; [[NiceJobBreakingItHero Grimmel also heard her babbling about the tribe's new island base and had her followed back to them]].]]

* TalkingTheMonsterToDeath: Ruffnut ends up getting left behind when the riders escape from Grimmel's tower. What follows is a scene where Ruffnut talks non-stop, either insulting her captors or goes on wild tangents about her personal life. It annoys Grimmel so much that he lets her out and demands that she leaves, even providing her a dragon to ride on. Granted they end up following her, but it is still hilarious.

* SmokeOut: The Light Fury is able make herself temporarily invisible by flying through the explosion of her plasma blast.

* InterspeciesRomance: WordOfGod is the Light Fury is not actually a Night Fury, just a similar related species. This doesn't stop Toothless from courting her. Several other Light Furies are shown in the Hidden World, so she's definitely not the [[LastOfHisKind Last of Her Kind]], unlike Toothless.

* ContrivedCoincidence:
** The titular hidden world is far out into the sea and has never been discovered by vikings before, [[spoiler:yet after the Light Fury takes Toothless there, Hiccup and Astrid take Stormfly to search for him and come across the hidden world almost right away. Although, they ''do'' mention that Stormfly is tracking Toothless' scent, giving an explanation]].
** The [[spoiler:time skip at the end of the film has Hiccup and his family traveling to find Toothless. Despite Toothless having moved to the hidden world, Hiccup finds him, the Light Fury and their hatchlings chilling on some rocks on the surface at the same time they decide to search for them.]]

* AnachronicOrder: The film's narrative is slightly less linear than the previous films, mainly through flashbacks to Hiccup's childhood and a flash-forward to Hiccup as a grown man for the epilogue.

* AbortedArc:
** [[WesternAnimation/HowToTrainYourDragon2 Drago Bludvist]]'s intended return in this film was scrapped halfway through production. [[SequelNonEntity His absence is explained]] by [[BigBad Grimmel]] saying that he was "defeated" a year earlier, meaning that he either gave up after his attack on Berk in the previous film or had another failed attempt shortly after.
** It's also unclear how his Bewilderbeast managed to find its way into the Hidden World, or whether he failed at his quests without his Alpha at his command.
** [[spoiler:The idea of Hiccup using his father's notes to find The Hidden World is abandoned once the vikings have left Berk. While Hiccup and Astrid end up finding it anyway, it is the result of unrelated circumstances and not thanks to Hiccup's original plan.]]

* YouAreBetterThanYouThinkYouAre: One of the CentralTheme of the film. Hiccup and his friends have become too dependent on their dragons, so when they face an OutsideContextProblem that dragons cannot or not available to solve, [[WeHaveBecomeComplacent they became less competent.]] The crux of the film is Hiccup and friends learning to stand on their own, [[spoiler:which allows them to deal with parting ways with their dragons so they can go live in peace in the Hidden World.]]

* VillainHasAPoint: Grimmel mocks the idea of humans and dragons being able to survive alongside each other as equals, noting that humanity has repeatedly proven to be the superior species. Sure enough by the end of the film the surviving dragons have all retreated to the Hidden World, leaving humans to rule the surface.