Down on His Luck

While Mala is away on a diplomatic mission, Dagur decides to explore the icy caves under his island where Hiccup had previously discovered the King of Dragons, the massive Bewilderbeast with its egg. It turns out to be not such a great idea when Dagur discovers that the icy caves are inhabited by something else as well, something much less accepting of human intrusion.

*idea inspired by @Atali_Maiden , thanks!*