Quick recap
The riders learn they're not alone out there: dragon hunters led by the brothers Ryker and Viggo Grimborn capture dragons to sell and use. Viggo isn't like earlier villains; he thinks several moves ahead and studies Hiccup like an opponent across a board. Meanwhile, the gang learns the truth about Heather's family, and Dagur becomes a problem again. The season leaves the hunters as Dragon's Edge's biggest threat.

