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.
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.
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 realise they aren't alone.
Burple finds a crystal that makes him the strongest of all the Rescue Riders; when Axel Finke reports that he saw a dragon crash into the side of a volcano, "The Incredible Burple" is put in charge of the rescue mission.
After a terrible odor blows into Huttsgalor, the Riders fly off to investigate and meet a young Stinkwing; the gang works to find a way to help the Stinkwing improve his smell.
When Haggis goes missing during the annual All Islands Viking Sheep Festival, the Riders must solve the mystery of what's happened to him to prevent conflict from breaking out between the islands.
When items begin disappearing from Huttsgalor, the Riders investigate and cross paths with a pack of fast-flying Zoomerangs; to get back Huttsgalor's stuff, Winger agrees to race the lead Zoomerang around her dangerous island.
