The Riders accept an invite to Berserker Island, where their reunion with Heather, Dagur and a young familiar face is interrupted by a sudden revolt.
Booker, Nia, and Levi convince Raven and Chelsea they are responsible enough to watch themselves while the moms celebrate a “moms’ night out.”
Johnny confronts his nemesis face to face when Delle Seyah suddenly arrives to set terms of war via parley.
Jimmy Carr hosts the show while guest captain Kathy Burke and Roisin Conaty take on guest captains Johnny Vegas and Bob Mortimer. John Cooper Clarke is in Dictionary Corner.
The Raza's crew attempt to unite Ferrous' enemies and put an end to the corporate war before the new fleet can be used.
Ray from Swindon is fed up of dating bad boys and is looking for a nice naked guy. Barman Jimmy wants to settle down in Bristol. Can he find his perfect partner in the buff?
Wynonna is running out of time, and is desperate to defeat the widows before her fate is sealed.
An unlikely ally helps Hiccup uncover Singetail behaviors that can be exploited to conquer the Flyers. An overconfident Krogan makes a strategy error.
When Ruffnut refuses to become Throk's bride because it would mean leaving her twin, Tuffnut fakes his own death to give her the freedom to marry.
After Stormfly tangles with two poisonous Slitherwings while defending Garff, Astrid must risk her own life to get an ingredient to make an antidote.
When Heather goes to meet a man claiming to have seen Oswald, she walks into a trap that forces the Dragon Riders to pay a dear and unexpected price.
A sketch in an old diary leads Hiccup and Fishlegs back to Vanaheim, where they help Dagur search for his long-missing father, Oswald the Agreeable.
The Outcast leader, Alvin, is kidnapped and held for ransom by bandits. They call on the Dragon Riders to request the assistance of Thor Bonecrusher.
The Riders flee to Berk, where Stoick's plan for defeating the Flyers, which will require a painful sacrifice, spurs Hiccup to seek an alternative.
After the Edge is ambushed by a group of Singetails, the Riders quickly take flight to ward them off, but are shocked when they get a closer look.
Disobeying Hiccup, the twins follow a retiring Eruptodon to its final resting place, Vanaheim, and learn why no human has ever gone there before.
When Snotlout is rescued from a storm by a tribe of winged women, he thinks he's gone to Valhalla -- until he learns he's going to be their dinner.
While trying to stabilize the volcano that threatens to destroy Dragon's Edge, the Riders discover troubling evidence of new Hunter activity.