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.
S6, EP6 "Mi Amore Wing"
An announcement leads Astrid to question her relationship with Hiccup; the Riders discover an Armorwing that has a Dragon Eye lends welded to its body.
S6, EP5 "A Gruff Separation"
Hiccup grows wary when Gruffnut arrives on the twins' 19th birthday to administer a Thorston coming-of-age ritual involving three dangerous challenges.
S6, EP4 "Loyal Order of Ingerman"
Upset after learning his ancestors were Hunters who killed off Dramillions, Fishlegs sets out to see if he can find any of the dragon species left.
S6, EP3 "Chain of Command"
During a trip to Wingmaiden Island to find a Dragon Eye lens, Snotlout challenges Hiccup's leadership; on another island, an unlikely romance blooms.
S6, EP2 "No Bark, All Bite"
Stoick and Hiccup are led on a wild goose chase in search of willow bark for medicine, leaving Berk vulnerable to an enemy attack.
S6, EP1 "In Plain Sight"
While hunting for gemstones needed to complete the Dragon Eye 2, Hiccup learns an old friend isn't who he seems; Dagur faces a bully from his past.