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Furious is the secondary antagonist from the the How to Train Your Dragon book series. He is a Seadragonus Giganticus Maximus.



Furious and his brother, Hiccup Horrendous Haddock II, who got vanished by his real father were adopted and raised by Grimler Dragons. When Hiccup is back to his real father, Grimbeard the Ghastly, who is the king of the wilderwest, they spent time together. Hiccup's real brother, Thugheart lied that Hiccup is a traitor by making humans and dragons fight. Grimbeared the Ghastly started the war against dragons and he stabbed Hiccup, and he died. As a result, Grimbeard stopped being a king, because he is not worthy enough. He vanished Thugheart as an outcast and made Chucklehead, his other son be the chief of the Hooligan Tribe.

How to Break a Dragon's Heart

Furious got captured and chained in Berserker Island and When Hiccup Horrendous Haddock III is on his hand, Hiccup recognized him and freed him, because of the scar on the dragon's chest. After he is freed, he choose to start the war against humans.

How to Seize a Dragon's Jewel

Furious sent one of his dragon minions, the Deadly Shadow, a three headed dragon to find Hiccup. Once it found Hiccup, it did not attack him for recognizing the Lobster Claw Necklace.

How to Fight a Dragon's Fury

In the final battle, after Hiccup got crowned as king, Furious started fighting Hiccup when he rides his Windwalker Dragon. Furious later redeemed himself. When Excellinor the Witch is about to stab Hiccup, Furious protected him and threw the witch in the geyser and she died. Furious got stabbed and got poisoned. He went away from the archipelage, because what he did was to start the war against humans, which was very wrong.


Furious is a Seadragonus Giganticus Maximus, the biggest and most powerful dragon species. He appeared very gigantic in size. He is about twenty times bigger than the blue whale. His scales are blue and he looks like a typical dragon, but way bigger. When Furious was captured, he appeared green, because he was covered in moss.


He believes that when Hiccup III becomes king, it will be the end of the dragons, and also believes that people and dragons are mortal enemies and this is why he started the war. This is not the correct case, because when Hiccup became king, everything became peaceful.


  • Hiccup I, Hiccup II and Hiccup III owned a dragon with a scar on the chest. Hiccup I has Wodensfang, Hiccup II has Furious and Hiccup III has toothless.
  • A Seadragonus Giganticus Maximus started as a very small baby, about a size of a nano dragon. They become gigantic after hundreds of years, then they become very small when they are old. Their lifespan is a thousand years.


           How to Train Your Dragon logo.png Villains

Alvin the Treacherous† | Furious† | Green Death† | Purple Death† | Norbert the Nutjob | Excellinor the Witch† | Hairy Scary Librarian | Snotface Snotlout† | Venomous Vorpent

Northern Alliance
Drago Bludvist† | Drago's Bewilderbeast | Eret's Crew (Eret) | Warlords

Dragon Flyers
Krogan† | Mr. Murderous Pile of Yak Dung† | Flyer Leader

Dragon Hunters
Viggo Grimborn† | Ryker Grimborn† | Cleve | Ingar Ingerman† | Dragon Hunter Commander† | Fight Master

Outcast Tribe
Alvin the Treacherous | Mildew | Savage

Berserker Tribe
Dagur the Deranged | Savage

Red Death† | Boneknapper | Whispering Death | Skrill | Screaming Death | Slitherwings | Firecomb Crasher | Hookfang's Nemesis | Drago's Bewilderbeast | Deathgrippers

Grimmel the Grisly† | Johann† | Amos | Calder | Gruffnut Thorston

Rescue Riders
Magnus Finke | Slinkwing Trio (Lurke) | Waldondo del Mundo | Erik the Wretched | Svetlana the Sly