After getting into a fight, Hiccup and Astrid storm off on their separate ways. But before they have a chance to apologize, they are attacked by another tribe. (Post-HTTYD2)

While attempting to build a tree house, a terrible accident occurs involving Snotlout, Hiccup and a wooden plank. To make matters worse, a new threat is looming over Berk, waiting for the right moment to nab "The Dragon Conqueror." (Set shortly after the last non-flashback scene in "Dawn of the Dragon Racers.")

While searching for Outcasts around Breakneck Bog, Hiccup and Astrid find themselves stranded on Changewing Island, with nothing but each other, their dragons, and tons of wild, angry, acid-spitting Changewings.

At the last minute, a young boy shows up to the brotherband choosing and is put into the Herons. When Hal discovers his new friends secret, will he turn Zac in? or will he fight to keep his fellow heron in the runing? What consequences will this cause?

Hiccup didn't see the point in stopping Astrid as she ran off towards his village—towards his father—with his most desperately protected secret. He was leaving anyway. A coming-of-age tale. Deviates from movie. Borderline bromantic-comedy.