ookfang is losing his ability to catch on fire, and it's up to Snotlout, Hiccup and the others to find the lair of the Fireworm Queen, which may hold the only possible cure, before it's too late.
America Ferrera Astrid
Christopher Mintz-Plasse Fishlegs
Mark Hamill Alvin the Treacherous
Jay Baruchel Hiccup Horrendous Haddock III
T.J. Miller Tuffnut
Zack Pearlman Snotlout