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.

When metal-eating baby Razortooth Metalmaw dragons follow Magnus back to his workshop, he must ask the Rescue Riders for help before the babies eat him out of house and home, literally.

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.

When items begin disappearing from Huttsgalor, the Riders cross paths with a pack of Zoomerangs.

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.

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.

The Rescue Riders meet a seemingly friendly young dragon with a unicorn horn and rainbow powers.

Burple finds a crystal that makes him the strongest of all the Rescue Riders.

After a terrible odor blows into Huttsgalor, the Riders fly off to investigate.

When Haggis goes missing during a festival, the Riders must find him to prevent a conflict.

Dak and Leyla challenge each other to get through one day without their dragons.

When Zeppla and Sparkle return to Huttsgalor, the Riders help them fill out the rest of their team.

The Rescue Riders return to the Sunken City to stop Magnus Finke from finding the Alpha Crystals.

Cutter finds himself with a personal bodyguard after saving the life of a Chaperange dragon.

When a giant sea dragon named Gludge swallows a Boomback egg, Leyla and Aggro must save it.

When a young, bullied aquatic dragon meets the Rescue Riders, he decides he wants to live with them.

The Riders get ready to celebrate “Nest Day,” a tradition from their days in the wild.

On a wild day in Huttsgalor, one of Magnus' new Mechanos runs amok, Slinkwing Lurke attacks the town and Elbone goes missing while on a new business venture.

Nothing is as it seems when the Rescue Riders team up with Marena to save Waldondo del Mundo after he's captured by Erik the Wretched.

When Burple finds an old flyer for "The Amazing Arno's Carnival of Dragons" in one of his stomachs, Dak and Leyla tell Duggard the story of Burple and Cutter's carnival days and how they broke out to join the Rescue Riders.

While Leyla, Summer and Cutter are off helping Elbone with his latest business venture, Dak, Winger, Aggro and Burple find themselves dueling for control of the Roost with a mischievous Copyclaw dragon.

When Dak and Leyla cross paths with a dragon whose blast wipes out memories, it's up to Winger, Summer, Burple, Cutter and Aggro to find a way to bring their memories back before they forget they're Rescue Riders forever.