When Viggo offers Hiccup a truce, the wary Dragon Riders investigate and find a potential ally in their fight against the Dragon Hunters.
The gang investigates why Viggo's men are mysteriously shipping marble blocks from a quarry. Next, they try to save two dragons being used as slaves.
Snotlout is sent on an undercover mission to Viggo's dragon auction as part of a plan to rescue the dragons and stop Viggo from getting richer.
When Viggo offers Hiccup a truce, the wary Dragon Riders investigate and find a potential ally in their fight against the Dragon Hunters.
Heather's brother Dagur shows up out of no where and asks Hiccup for help finding her. He wants to learn to ride dragons. Dagur sees Heather on the edge and goes the extra mile to protect her.
The dragon riders take a dragon egg from the dragon hunters and they try to train the baby dragon. Will they be able to do it?
Viggo is building an impenetrable fortress that even dragons can't break through, it's up to Hiccup and the gang to stop him.
When Hiccup and Toothless are kidnapped and Toothless is forced to fight other dragons for entertainment, the rest of the dragon riders must save them before it's too late.
When things don't go well while Fishlegs is in charge, he gets another chance to prove he has what it takes to be a leader.
While trying to take care of unfinished business, Hiccup and Toothless are lured into a trap. An unlikely rescuer comes to their aid.
After learning that Fishlegs has been secretly communicating with Heather, the gang invites her to the Edge to convince her to join the Dragon Riders.
After Astrid makes an alarming discovery, her life comes to depend on a dragon everyone thought was extinct. Her pals race against time to find it.
When the Dragon Riders fly to an island on a vacation, a small creature there has a special effect on the dragons.
When a mysterious dragon attacks Spitelouts storehouse, Spitelout and Stoick have different ideas on what to do next.
A wounded Fireworm seeks the Dragon Riders' help in protecting a precious treasure trove from an unfamiliar creature with strange and slimy powers.
Buddy Valastro and his family's road trip continues as they reach the Louisiana Bayou. There, they tour swamps full of live alligators and make some extraordinary food stops, starting with fried shrimp and oyster po' boys at the Olde Tyme Grocery in Lafayette, La. Next, Buddy takes the cooking into his own hands and prepares boudin, a Louisiana-style spicy sausage filled with rice and vegetables. The search for eccentric local foods continues with a stop at Dark Roux for elevated southern classics, then to their last stop: Crawfish Town USA!
Megan befriends Chido and forms a band with her called "Character Select", but struggles to keep their friendship and band a secret.
After Clarence learns Sumo’s in the school musical, he joins up and enthusiastically promotes the show. On opening night with a packed house, stage fright takes hold of Sumo and he runs off leaving Clarence to go on alone.
There is a school inspector coming round and the school is to be on its best behaviour. Meanwhile, Hank is trying to do a good turn to McKelty but ends up injuring him more. Hank gradually makes friends with him and they bond over McKelty's funny (but slightly rude) caricatures of members of staff. However Hank accidentally hands them in to Adolf and a chase ensues as Hank and McKelty try and get them back. They finally get them back, only for Hank to accidentally push McKelty and his wheelchair down some stairs, injuring him and the School Inspector in the process. Meanwhile Rosa is fed up at the mess in the house and decides to leave all the dishes, hoping someone will get the message.
It's getting hot in here. When the thermostat breaks, it falls on Talking Ben to hack the system and restore the righteous temperature to all. But everyone breaks a cold sweat when he makes it freezing instead. Can the gang get their cool back when too much power pushes Ben over the top?