The film is set five years after the events of the first film,when Hiccup and Toothless and the other Vikings are in their late teens.
It's been five years since Hiccup and Toothless successfully united dragons and vikings on the island of Berk. While Astrid, Snoutlout and the rest of the gang are challenging each other to dragon races (the island's new favorite contact sport), the now inseparable pair journey through the skies, charting unmapped territories and exploring new worlds. When one of their adventures leads to the discovery of a secret ice cave that is home to hundreds of new wild dragons and the mysterious Dragon Rider, the two friends find themselves at the center of a battle to protect the peace. Now, Hiccup and Toothless must unite to stand up for what they believe while recognizing that only together do they have the power to change the future of both men and dragons.
Jay Baruchel as Hiccup Horrendous Haddock III. The sophisticated and brilliant teenage son of the Viking chief. His best friend and dragon is Toothless, a Night Fury.
Gerard Butler as Stoick the Vast, the chieftain of a Viking tribe and Hiccup's father.
Craig Ferguson as Gobber the Belch, Stoick's closest friend and a seasoned Viking warrior.
America Ferrera as Astrid Hofferson.
Jonah Hill as Snotlout Jorgenson.
Christopher Mintz-Plasse as Fishlegs Ingerman
T.J Miller and Kristen Wiig as Tuffnut and Ruffnut Thorston, fraternal twins.
Kit Harington as Eret, a dragon trapper
Cate Blanchett as Valka, a feral vigilante, who rescues dragons
Dijimon Hounsou as Drago Bludvist, a dragon hunter