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.

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

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

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.

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 attempts to defeat the World Serpent by emulating Hiccup.

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

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

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

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

Tom and the riders must finally overcome their differences and come together as a team to survive the Dark Realm.

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.

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

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.

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.

When Jun does a Tarot reading for the team, she interprets its meaning to be that the riders will disband! In an effort to defy this fate, Jun forces the group to stick together as they search for a dragon that has breached the Rakke Town eel barrier.

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

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.

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

When Phil threatens to shut down D’Angelo’s new dragon hospital and ban dragons from ICARIS, D’Angelo and a little Hobgobbler have to change his mind.

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

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

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

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

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

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.

While Tom struggles with admitting his feelings for Jun, the pair find themselves trapped inside a giant tree with an anxious colony of Woodchipper dragons.

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.