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.

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.