S6, EP13 "King of Dragons, Part 2"
The Riders race to the home of the true King of Dragons, but the Flyers are already there and they soon come face to face with the legendary creature.
S6, EP12 "King of Dragons, Part 1"
With the fifth lens in place, the Dragon Eye 2 unveils the apparent King of Dragons; Fishlegs immediately knows what it is and where to find it.
S6, EP11 "Guardians of Vanaheim"
After learning several Flyers followed Heather to Vanaheim, the Riders must stop them from reporting the sacred island's location to their leader.
S6, EP10 "Darkest Night"
While on night patrol, Stoick is ambushed by the Flyers and gravely injured, leaving Hiccup torn between his duties as a son an das the Riders' leader.
S6, EP9 "Family Matters"
After learning Krogan is using a Deathsong to lure and subdue Singetails for his growing army of Flyers, the Riders set out to rescue the dragon.
S6, EP8 "Triple Cross"
When the Flyers try to kill him because he's no longer useful, Viggo forces Hiccup to help him get revenge by stealing their Dragon Eye and lenses.
S6, EP7 "Ruff Transition"
While visiting Wingmaiden Island, a baby Razorwhip bonds with Ruffnut, who suddenly finds herself trying her hand at being a Wingmaiden.