Moving to an exotic new home, an adventurous teenager meets a new group of kids and discovers a dragon in the fissure.

Tom forges a friendship with the dragon and discovers an entire world of dragons within the fissure.

Tom and Jun encounter unexpected dangers and are separated while exploring the Hidden Realm of dragons. Tom introduces Jun to the dragon world, and Jun bonds with a dragon of her own – Wu and Wei.

Tom and Jun take a risk in revealing the secret of the Hidden Realm to D’Angelo to aid an injured dragon, and D’Angelo bonds with Plowhorn.

Tom and the others debate how to keep the dragons a secret, even as a rambunctious young “cloaking” dragon gets loose in town and pursues a friendship with a Alex.

Tom and the Riders try to save ICARIS when it's revealed to be in danger from a monstrous dragon.

Jun breaks the rules by sneaking a small, adorable dragon out of the Crystal Realm and bringing it home, but finds that her older brother, Eugene, has arrived and watches her every move.

Tom has to keep his mom, Olivia, distracted while Jun, Alex, and D’Angelo use a new dragon to close off a cave leading to the Crystal Realm, and prevent her from discovering the dragons.

When Feather is taken by a group of what appear to be zombie dragons, Alex finds her inner hero and rescues her friend.

Tom and Thunder train a new species of aggressive tidal dragons to help the other riders put out a forest fire threatening ICARIS.

Tom and D’Angelo must come together to help Alex and Jun escape the clutches of the Spiderwings.

Tom and the riders go in search of Thunder and must face a gauntlet of dangerous dragons to find their lost friend. Along the way, Tom reveals his big secret to D’Angelo and Alex.

Tom and the riders help Thunder, who is seeking revenge against the dragons that chased off his family.

Tom hatches an unorthodox plan to use a Monstrous Nightmare to test Alex's new fire suit, endangering the secret of dragons.

After a fight with her mom, Jun joins Tom on an adventure into the Fire Realm, where her knowledge of myths saves the day.

When a tiny Fireworm dragon ends up at ICARIS, Alex must decide between her mom's excitement and keeping the dragon secret.

During an attempt to get displaced Fire Gronckles back to their native realm, D'Angelo accidentally feeds them Catastrophic Quaken eggs.

Eugene discovers the Lair and demands a dragon of his own.

The dragon riders must sneak a very sick Magma Breather into the ICARIS infirmary.

The Sky Torcher and Flame Throwers invade the Crystal Realm; Tom must conquer his demons and bond with the Fault Ripper to defeat the Sky Torcher.

Tom and the riders discover the Ice Realm and find Buzzsaw inside.

Alex and Eugene find themselves at odds with Tom and their fellow dragon riders when Feathers and Webmaster go missing during a blizzard in the Ice Realm.

Jun struggles to convince Tom to trust her faith in myths over the Book of Dragons when they venture to a place that his book seems to say is extremely dangerous.

Tom’s leadership abilities come into question by Eugene when his decisions lead to failure while attempting to confront Buzzsaw.

Tom and Thunder discover a baby Nightlight and must bring him back to Thunder’s home realm.

When Thunder’s clan of fellow Nightlights is attacked by the Snow Wraith, Tom vows to rescue them.

While punished, Tom must sneak out to rescue the Riders from Buzzsaw.

Tom orchestrates a “safe” tour of the realms to convince Olivia that the Hidden World is safe for them to explore.

A mischievous new breed of dragons called Vine Tails steal the Book of Dragons.

Tom and the riders must work together to rescue Eugene from a dragon’s nest.

Tom must rescue Olivia from the Hidden World when she winds up getting herself frozen by a pack of hungry Speed Stingers.

When a deep freeze puts the lives of everyone in Rakke Town in jeopardy, the riders must attempt to use the dragons to get the humans through the night without being seen.

Tom struggles under the pressure of being the new ‘Dragon Whisperer’ for Rakke Town; Thunder rises to the occasion to help him.

When the parents leave for the night and tell the riders not to bring the dragons to the surface while they’re gone, D’Angelo and Eugene get locked in the hangar (with the dragons!) after Eugene triggers a security lockdown.

Jun forms an unlikely connection with Sledkin.

Eugene’s bond with Webmaster is put to the test when Webmaster leaves the group for a pack of Deathgrippers.

Tom sets out to prove Sledkin caused an explosion that injured a dragon in the Hidden World.

When the dragons fall victim to Buzzsaw’s poison darts, D struggles to keep a cool head and find a cure while others panic.

Tom and the riders “borrow” the bathysphere to rescue a dragon from the depths of the Giant Realm Sea.

Tom attempts to defeat the World Serpent by emulating Hiccup.

Tom and the dragon riders foster displaced Hidden Realm dragons in Rakke Town but things get complicated when Mr. Rakke makes a surprise visit.

The Dragon riders enlist the aid of Carla and Hazel and their scientific knowledge to help them prepare for a mission to neutralize Jörmungandr so they can return him to his chamber and seal him back inside.

Tom and the riders must rescue Plowhorn from Sledkin when the villain abducts the dragon to help her find the Gods Realm and the Dragonsite jewel.

Tom’s overconfidence turns to frustration then despair as he struggles to procure the ingredients for Gronckle Iron in hopes of building a trap to stop the World Serpent.

After a major miscalculation by Tom in 225 leaves the fate of the Realms in jeopardy, Jun and the riders rally behind Tom and Thunder to face off against the World Serpent.