It's been six years since dragons and vikings were united.
Hiccup is now chief of Berk due to his father's untimely death, but the loss of one parent resulted in the return of another, his mother Valka.
Toothless, Hiccup's best friend and trusted right-hand dragon, is now Alpha to the Dragons, after the fall of the Bewilderbeast.
Hiccup has a long ride as he has to be accepted as chief and prove himself worthy and with fellow dragons riders, Snotlout, Fishlegs, Ruffnut, Tuffnut and of course, Astrid and their trusty dragons, he knows he can do it.
Things are looking up for the Berkians, but Odin has other plans.
The return of old faces, results in new enemies and the entire village is put into danger by someone unexpected.
Who can the Berkians trust, especially when it now seems that everyone is an enemy?
And also, what will come of Astrid and Hiccup's love when a green-eyed monster will do everything in her power to break them apart, claim Hiccup and rule Berk for her own?
Hiccup has been betrayed by Astrid and banished and disowned by his father Stoick the vast. Hiccup leaves and vows that he would free all the dragons and show them the way to peace with the dragons. So he starts to raid the ships that have dragons on them and frees them. This continues for a year. He makes allies and enemies. His life seems ok but when he is shot down by a berkian dragon capturing boat. His life takes an usual twist......