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

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

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

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.

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.

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

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

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.

Jun forms an unlikely connection with Sledkin.

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

Thunder must wrangle and lead the Hero Dragons in a desperate attempt to save Tom and the riders from a dangerous new dragon, The Glass Caster.

With the dragon riders disbanded, Eugene attempts to start his own Dragon Club.

Tom attempts to defeat the World Serpent by emulating Hiccup.

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.