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

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

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.

When Thunder accidentally fries Alex’s tablet, Alex goes off on her own and is captured by Buzzsaw.

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’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.