When Chief Ingrid of the neighboring island Guttsgalor shows up looking for the ceremonial goblet, the Rescue Riders must find where Duggard hid it before a battle breaks out between the two islands.

After Elbone goes missing, the Rescue Riders find his boat near an island covered with unusual crystals; when they search for him inside a cave, they realize these crystals have a unique effect on the dragons' power.

When the gang is stuck inside during a blizzard, they start going a little stir crazy; to pass the time, Leyla decides to tell the story of how she met Summer before they came to Huttsgalor and met Burple, Cutter and Aggro.

When Snoop, one of the villainous Slinkwing dragons, loses two of Vizza's Slinkwing babies, he turns to the Rescue Riders for help.

Elbone's older brother Albone pays a visit to Huttsgalor; Chief Duggard lets Elbone be chief for the day; the Rescue Riders must race to clean up messes before Elbone is embarrassed in front of his brother.

The Riders set out to find the sunken city of Valantis -- an ancient Viking hub where dragons and humans coexisted -- but when they find it, they realize they aren't alone.