When Chief Ingrid of the neighbouring 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 realise these crystals have a unique effect on the dragons' power.

The gang becomes restless after getting stuck inside during a blizzard. 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.

Snoop, one of the wicked Slinkwing dragons, seeks assistance from the Rescue Riders after losing two of Vizza's Slinkwing babies.

Elbone's older brother Albone unexpectedly arrives in Huttsgalor; Chief Duggard allows Elbone to be the chief for the day; to avoid Elbone some embarrassment in front of his brother, the Rescue Riders race against time to clean up the mess.

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 realise they are not alone.