How to Train Your Dragon Wiki
How to Train Your Dragon Wiki

Thunderdrum. This reclusive dragon inhabits sea caves and dark tide pools. When startled, the Thunderdrum will produce a concussive sound wave that can kill a man at close range. [src]
  Hiccup as he reads through the Dragon Manual  

The Thunderdrum is a large Tidal Class dragon that was first mentioned in How to Train Your Dragon and first appeared in The Book of Dragons.

Official Description

Instead of breathing fire, the Thunderdrum produces a strong, concussive sound that can kill a human at close range. The blast is so powerful that the dragon is said to "get its power from Thor himself".
Legend also has it that when the Thunderdrum hatches from its egg, it makes a sound so loud it rattles the sky.
When not swelling its body up to yell, Thunderdrums can actually flatten their body by expelling all oxygen from their massive lungs for a limited period of time. In this sleeker state, Thunderdrums can better skim the ocean surface or even dive beneath the waves in search of prey.
While it's true that Thunderdrums create tremendous amounts of noise, they also possess the ability to cancel out each other's sonic blasts. By modulating its roars to the proper frequency, a Thunderdrum can use its soundwaves to negate an attacking Thunderdrum's bellow, rendering it into a rather calming wave of white noise.
At home on land or sea, this Tidal Class big mouth has a Sonic Blast strong enough to kill a Viking . . . or at least soil his britches.
The Thunderdrum holds a steady course in a fight while it blasts opponents with a sonic boom.
  Dragons: Rise of Berk  
Classified as members of the Tidal Class, Thunderdrums are large dragons that can thrive in land or sea. They are known for their massive mouths that generate sonic blasts strong enough to stun a human at close range. For this reason, Thunderdrums are believed to derive their power from Thor himself.
Because of their sonic blasts, Thunderdrums tend to be nearly deaf, making them immune to the Death Song’s call. They can fly at extremely high altitudes. Along with their incredible strength, they also possess a prehensile tail that is strong enough to carry heavy items. They can breathe fire too, but this takes a lot of energy out of them and is not their preferred method of attack.
What is also fascinating about the Thunderdrum is how it swims through the water. It has the ability to expel air from its lungs to flatten its body. This makes it easier for a Thunderdrum to skim along the surface of the water, or to dive deep down to hunt for food.
These dragons may be strong-willed and intimidating, but with a dedicated trainer that is just as stubborn, the Thunderdrum can become a loyal friend.
  School of Dragons Website[1]  
Thunderdrum is capable of delivering a thunderous sonic blast that can be heard for miles. The winds which accompany the blast can even snuff out a rival dragon's fire.
  DreamWorks Dragons: Wild Skies  

Physical Appearance


In the Movie Short, Book of Dragons, the Thunderdrum's egg appears to have a base color of aqua, with lime green speckling.

Thunderdrum Egg.png

In School of Dragons, the eggs have electricity running through the eggs. The egg's core is glowing while the exterior is of a lighter shade of blue.

In Dragons: Rise of Berk, the egg comes in various colors. They have a slightly more pointy top. Faint specks can be found in its middle and it appears to be rather shiny.

Hatchling to Adult

This dragon relies mostly on its two sets of wings, one primary and one smaller set to the rear, using them to get around and move through the water like a tornado.

These dragons have stubby thin legs and long, skinny tails. It also has a series of backward facing spikes lining its back. The Thunderdrum's body resembles several marine creatures such as a basking shark, a whale shark, a manta ray, or a baleen whale. According to the Dragon Manual, Thunderdrums have really powerful wings and the spikes on their tails are very sharp.

In Dragons: Riders of Berk, this dragon is just bigger than a Gronckle (excluding the tail), but in How to Train Your Dragon 2, it is much bigger.

All Thunderdrums seen in adaptations before How to Train Your Dragon 2 are not much larger than medium or large-sized dragons. Baby Thunderdrums grow up to 11 inches tall, according to the Dragonpedia.

In How to Train Your Dragon 2, much larger Thunderdrums are seen. These Thunderdrums are longer than Blue Whales and their wingspan is long enough for Toothless to fly under one that was jumping out of the water. The maximum size for these dragons is unknown. Thunderdrums in this size are probably too expensive to animate, so they are smaller in the Series.

Titan Wing

Titan Wing Thunderdrum.jpeg

Titan Wing Thunderdrums are larger than their Broad Wing counterparts. They have three main colors on their body: blue, turquoise, and purple. Their wings have these three colors and many white specks. The talons on the edge of their wings grow larger. Their body is mainly blue in color. These Titans possess lots of sharp teeth and a long ledge, with its nostrils, on the top of its snout. Their second set of wings is larger and they have a row of spines along their tail and spikes all over their back.



The poferdul sonic blast of an adolescent Thunderdrum.gif

It is said that when a Thunderdrum hatches from its egg, it makes a sound so loud it rattles the sky. Baby Thunderdrums have the strength to be able to drag two teenage Vikings on their tail with little effort. As hatchlings, their thunderous roar is powerful enough to send heavy Vikings into the air and can destroy some large objects such as Hiccup's invention, the Thunder Ear. As shown in “Bing! Bam! Boom!”, a single Thunderdrum hatchling’s sonic blast is ineffective on adult dragons.

Sonic Blast and Fire Blast

Thornado uses its Sonic Blast against boars.gif

The Thunderdrum produces a strong concussive sound that can kill a human at close range. It is not only capable of temporarily stunning other dragons but can also extinguish flames shot by other dragons. The blast is so powerful that the creature is said to "get its power from Thor himself." Only the Screaming Death has a tolerance with this attack (able to

Power of the the combined sonic blasts.gif

stun it temporarily). By combining roars of several individuals, the roars are able to knock away several large dragons at a distance. As shown by Earsplitter, when an adult Thunderdrum's sonic blast hits a human at close range, it would render them nearly deaf after the attack.

The Thunderdrum delivers a sonic blast so loud, it can be heard and felt miles away.[2] This sonic blast has also been stated to lower the air pressure in its way, making it feel cold on contact.[3]

Thunder fire.jpg

Like its sound wave booms, the Thunderdrum can blast waves of blue fire that get bigger the farther they go, while travelling at the speed of sound. The downside to this power is that it takes a lot out of a Thunderdrum to employ it, so it's not often used.[4][5]

In order to protect themselves from their own sound emissions, the Thunderdrums developed a system to offset sonic blasts by regulating wave frequencies of blasts to neutralize others' roars.

Thornado pull 2 ships.gif

Strength and Combat

Thunderdrums are some of the most powerful dragons. They are also some of the all-around most useful dragons as they can dive down to the depths of the ocean and fly at extremely high altitudes.[6] As shown by Thornado, Thunderdrums can carry two large Vikings at once, or a large Viking such as Stoick while also pulling two ships out of the harbor, whereas Toothless had struggle lifting Stoick. Earsplitter was implied to have been battling the Death Song long before their appearance in "Imperfect Harmony". However due to adapting in their fights the Death Song was able to easily defeat the Thunderdrum and would of killed him if Hiccup didn't intervened.

Endurance and Stamina

A wild Thunderdrum chases Meatlug and Fishlegs.gif

Their endurance and stamina are very impressive as shown by Thornado, who was able to take attacks from Stoick and still fly at great speed. Thunderdrums have been seen defeating wild dragons, pull two ships at a time with the added weight of Stoick the Vast, defeating a whole herd of wild boars and a wild specimen has been seen destroying a row of sea stacks by flying through them.

Stoick and Thornado fight against wild boars.gif

Prehensile Tail

They also have been shown to be quite flexible, as Thornado managed to grab Stoick with his prehensile tail and pull him underwater as well as slapping away several wild boars in battle.

Thunderdrums can best hear other Thunderdrums.gif


As shown by Thornado in "Bing! Bam! Boom!", despite their poor hearing, Thunderdrums are able to hear whistle sounds when they are close by. As shown by Thornado, Thunderdrums have a acute sense of smell to track baby Thunderdrums on the sea stacks in the very same episode despite them being far from Berk. Thunderdrums can best hear other Thunderdrums, as shown in "We Are Family, Part 1", where Fishlegs accidently lures a wild Thunderdrum to the Dragon Riders and later Astrid was able to call the same wild Thunderdrum with a Thunderdrum call.

Immunity to the Death Song

Thunderdrum fights against Death Song.gif

The Thunderdrum's bellow is so loud they are protected from it ("rendering it into a rather calming wave of white noise!"). Because of this, Thunderdrums are nearly deaf, thus have no sense of hearing. School of Dragons claims that similar to snakes, Thunderdrums have no outer ear so they are virtually deaf out of water, but can hear very well underwater like whales and dolphins. Because of this, Thunderdrums are the only known dragon which is immune to the Death Song's siren call.

The Thunderdrum's bad hearing is also their strength, making them immune to their own sonic blasts and loud sounds that make most dragons disorientated. However loud sounds from dragons like the Screaming Death can disorientate them.

Speed and Agility

Hiccup and Earsplitter in action.gif

Thunderdrums are able to fly at great speeds in the air, and swim through water with perfect ease. Thornado was able dodging Toothless's plasma attacks with little trouble in his first appearance. A wild Thunderdrum is capable of keeping up with a Gronckle with not effort.

Despite the Thunderdrum's speed stat being only 14, Earsplitter was able to outfly a Death Song with a speed of 17. Due to this, it is possible that Thunderdrums actually have a speed stat of close to, or above 17.

Flattening their bodies while expelling all oxygen from their massive lungs also enables them to skim through the water at even greater speeds and allow for deeper dives for feeding.


Thunderdrums are stealthy dragons, as Thornado was able to sneak up on Bucket and Mulch while being in the ocean.gif

Thunderdrums are stealthy dragons, as Thornado was able to sneak up on Bucket and Mulch while being in the ocean. On land a Thunderdrum was able to stealthy sneak up on the Dragon Riders in “Imperfect Harmony”.

Thunderdrums are able to stay underwater for long periods of time.gif


Thunderdrums are capable of leaving the water and staying in the air for a period of time without drying out.gif

Being Tidal Class, Thunderdrums are able to stay underwater for long periods of time. They are very skilled swimmers. As shown by Thornado and Earsplitter, Thunderdrums are capable of leaving the water and staying in the air for a period of time without drying out, despite its aquatic nature. This makes them one of the few Tidal class dragons that have an amphibious nature to survive on dry land.

Resistance to Low Temperatures

Thunderdrums lay their eggs in arctic regions, mainly ice fields.gif

In the Book of Dragons short, it is revealed that Thunderdrums lay their eggs in arctic regions, mainly ice fields. Given that the babies have to survive in those frigid conditions, it is presumed that adult Thunderdrums can also endure low temperatures, likely even lower ones.


Bad Hearing

Hiccup realizes that the Thunderdrum can't hear.gif

The Thunderdrum can’t hear a command that might save their life. However loud sounds like a Screaming Death roar is loud enough to disorient them.

Short Legs

The gang runs away from Thunderdrum.gif

The Thunderdrum's legs are very short and wide set, making them very awkward while moving around on land. Nevertheless, they can still run as fast as a human.

Behavior and Personality

They form pods in a hunt or on migration.gif

They form pods in a hunt or on migration, a feature similar to those of cetaceans. Generally reclusive in nature when alone, living in sea caves and dark tide pools or in open waters.

Understandably, they are strident and assertive, the loud Thunderdrum always makes its feelings known.

Adolescents are shown to be mischievous to Vikings and dragons alike and they can be very annoying, as they don't stop roaring or mimicking other sounds. However, the adolescents will acquiesce to any adult of the same species,

regardless of relationship or lack thereof.

Thunderdrums are so stubborn that they can be tough to train. They show a real parental instinct to any young, even if it's not their own.

According to Hiccup in Race to the Edge, Thunderdrums have a habit of holding grudges against their enemies.


Hiccup Trains Earsplitter.gif
Adolescents also don't or can't listen except to mature adults.gif

Training a Thunderdrum, especially as an adult is a challenge partly due to their difficult personality and deafness. Showing protection and gaining the Thunderdrum's trust is an easier way to train it, as seen by Stoick and Thornado. Adolescents also don't or can't listen except to mature adults. It is easier to train one from birth or have an adult to help. However, adults can be very protective of their young, regardless of their offspring's' ill-behavior, as seen with Thornado when trying to watch over Bing, Bam, and Boom. These dragons give in easier during times of crisis, as displayed when Thornado had to save Whirlwing, or when Earsplitter had to save his child.

Dragons: Titan Uprising points out that because of their deafness, many Thunderdrums "respond best to visual cues during training", especially Reef Thunderdrums.

Comparative Statistics


How to Train Your Dragon

The Thunderdrum is one of the dragons Hiccup reads about in the Dragon Manual, while searching for information about Night Furies. Like all dragons, it's classified as an extremely dangerous creature that needs to be killed on sight.

Book of Dragons


The Thunderdrum first appears in this short. It is classified into the Tidal Class in the Dragon Manual and some of its features and abilities are revealed. Gobber tells the story of how Bork the Bold once found the nest of a Thunderdrum in a cold region. However, he didn't know that Thunderdrum eggs hatch with an explosive sound that rattles the sky, and he found this out the hard way.

Dragons: Riders of Berk

Main article: Thornado
Main article: Whirlwing
Episodio 7 - How To Pick Your Dragon.mp4 snapshot 19.23 -2012.11.19 00.44.14-.png

In "How to Pick Your Dragon", the Thunderdrum was first labeled as a rogue dragon attacking Berk's fishermen out at sea. While Hiccup tries to find Stoick a dragon so he can help his village more effectively, the rogue dragon strikes again. When they arrive on the scene, Stoick is satisfied with the beast and requests his son to help him train it. However, when they bring it back to the academy and put a muzzle on it to keep it from using its roar, Stoick brawls with it, causing it to escape.

After locating it, Stoick and Hiccup learn that it was accompanied by Whirlwing, another Thunderdrum that was injured, which is why it attacked the fishermen, so it could get food for its friend. Hiccup leaves to fetch the others while Stoick stays behind with the Thunderdrums, but they are soon ambushed by wild boars. Stoick finally bonds with the dragon and together they defeat the boars. He was eventually named Thornado by Stoick.

Dragons: Defenders of Berk

Main article: Bing
Main article: Bam
Main article: Boom
1964964 715407181833524 1294590599 n.jpg

In "Bing! Bam! Boom!", Hiccup and Stoick find three baby Thunderdrums on a sea stack. Puzzled why they were left there, the duo decided not to probe into the matter and left. The babies gave chase, but Thornado warded them off with his sonic blast. Hiccup, after convincing his father, brings them back to Berk to train and they were named Bing, Bam, and Boom. They prove to be too mischievous and stubborn to be trained and only listens to Thornado. Nearly destroying the village, Stoick orders them away. When they abandon the babies on an island, wild dragons instantly approach them, viewing them as easy prey. Realizing that the babies cannot care for themselves in the wild. Stoick bittersweetly sets Thornado free to care for the trio.

Dragons: Race to the Edge

Season 1

Main article: Earsplitter
Main article: Lil Lullaby

With most of their dragons mysteriously gone on Melody Island in "Imperfect Harmony", the gang sets off to find them, stumbling upon a wild Thunderdrum. After hitting them with his sonic blast, he was chased off by Hiccup and Toothless. Hiccup ran into him again while trying to escape the Death Song. While the Thunderdrum was mad at Hiccup about before, he focused more on fighting the Death Song. They managed to escape and Hiccup trained him to help save the others as the Thunderdrum was immune to the Death Song's call. After breaking the dragons and Riders out of the amber cocoons, Hiccup realized the reason why the Thunderdrum was fighting the Death Song was that it had captured his son. Hiccup and Toothless lured the Death Song into a cave and the Thunderdrum blasted it shut after the duo made it out. The Thunderdrum happily reunited with his son and Hiccup recommended the two find a new home.

Season 6

Thornado, Bing, Bam and Boom were among the many wild Thunderdrums that were summoned by the Berserker Bewilderbeast during the final battle against the Dragon Hunters and Flyers in "King of Dragons, Part 2".

How to Train Your Dragon 2

A pod of gigantic Thunderdrums was seen in the beginning of the movie, swimming at the surface of the open ocean while Hiccup and Toothless were flying past them.

How to Train Your Dragon: Homecoming

The Thunderdrum is pictured in a Dragon Manual formerly belonging to Stoick that Zephyr Haddock finds packed away in the Haddock House on New Berk.

Comics and Graphic Novels

The Ice Castle

During his Dragon Auction, Dammen mentions that he has Thunderdrum eggs for sale.

The Stowaway

A wild Thunderdrum gets into a fight with Stormfly over food, creating chaos in the village of Berk. Fortunately, Hiccup manages to stop the fight by giving both dragons food at the same time.

When Hroar goes to Dragon Island in order to enrage many dragons and lead them to Berk, he does so with several Thunderdrums. However, after he is thrown off his saddle, the Thunderdrums and all the other dragons return to their island.

The Legend of Ragnarok

When Hiccup and Astrid go out at the sea, they spot an agitated Thunderdrum and a Scauldron jumping off the water.

The Serpent's Heir

Several Thunderdrums appear along with other Tidal Class dragons that offer tribute to Toothless, their new Alpha.


How to Train Your Dragon: The Hidden World - The Movie Storybook

A Thunderdrum was briefly seen being ridden by a Berkian in this book, following the Alpha Dragon Toothless on a quest for the Hidden World.


DreamWorks Dragons: Wild Skies

In the game, Thunderdrum can be tamed. It lives in Wrecker's Reef, and one must feed it crabs or fish in order to tame it. You will need 10 Gold and buy a Crab Net, then go to Wrecker's Reef, where you then select the crabs. The Thunderdrum is a Tidal Class dragon, and it can release a sonic boom. When the player rides it, the dragon's mouth is closed. When you press the space bar, it will open its mouth and screech at the target. Other Vikings will say that the player is as strong as Stoick after having tamed it.

Dragons Hero Portal

Thunderdrums appear in this game as part of the armored dragons in Drago's Army. They attack the player - playing as a Rider/dragon pair - until the player blasts off the armor and frees them.

Thunderdrum info.png

Dragons: Rise of Berk

The Thunderdrum, along with its Titan Wing form, became available in Rise of Berk. Bing, Bam Boom, Earsplitter, Lil Lullaby, Whirlwing, and Thornado also appeared in it.

School of Dragons

The Thunderdrum is available in School of Dragons. Only members can own a Thunderdrum for free in the first pick. Stoick's Thunderdrum, Thornado, appears in the quest 'The Sickly Dragon' where Thornado is seen sick and you have to find mint leaves in the wilderness which is made into tea.

Dragons: Titan Uprising

Several Thunderdrum individuals, like Warcry, Waveshaker, Reef Thunderdrums, Tectonic Thunderdrums, and the Shifty Murklurker, and hybrids, like the Hoarsbrumble, appear in this game.


  • Asterisk-Transparent.pngThe official measurements of the Thunderdrum, as released by DreamWorks Animation are 68 feet (20.72 meters) in length, and 48 feet (14.63 meters) in wingspan.
  • According to Dragons: Rise of Berk, red-colored Thunderdrums such as Bludcrest were seen as bad omens prior to the advent of Hiccup's defeat of the Red Death.
  • The design of the Thunderdrums resemble spotted eagle rays in shape and color. They also appear to be based on sharks or baleen whales, as it has whale shark spots, basking shark mouth, and has a shape of a spotted eagle ray (which is a relative of the shark). Its torso could possibly be based on ridges on rorquals' belly that dramatically expand when they feed. Additionally, Thunderdrums' humming sounds similar to baleen whales' singing.
  • Though its overall power is 73, they have proven to be extremely strong. Thornado carries Stoick the Vast on his back while pulling two ships out of their harbor and at another time carries the latter and Gobber the Belch without showing any signs of struggle.
  • Thornado and the other Thunderdrums that appear in the TV series are much smaller than the ones in How to Train Your Dragon 2.
  • In "King of Dragons, Part 2", Bing, Bam, and Boom are about the same size as to how they were seen in their last appearance, which took place at least 3 years prior. Torch, Garffiljorg, and the New Protector grew to full size within only a few months. Though this might be an error in production.
  • Even though it has been stated that the Thunderdrum's sonic blast could kill a man at close range, the teens and Stoick only receive minimal damage or are just blasted away when Thornado, Bing, Bam, or Boom use their sonic blast. The Dragon Riders are also not affected when four of them use a combined sonic blast.
    • This is most likely due to the reduced levels of violence in the TV series.
  • The roar of the Thunderdrum resembles the sound of a TIE fighter from Star Wars.
  • It is possible that Thunderdrums hear infrasound better rather than normal sounds.
  • In the Dragons: Rise of Berk battle mode and brawl mode, the Thunderdrum doesn't expand its body, but only opens the mouth when firing the sonic blast.


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Thunderdrum uses Creative Commons Licensed content from the Dreamworks School of Dragons Wiki page Thunderdrum. The list of authors can be found on the page revision history (view authors). SODWikiLogo.png

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