When Lightning Strikes
S01E13 - Airdate: 2012-12-05
Runtime: 30 min
Sudden lightning storms are endangering the residents of Berk and it is believed that Thor is angry at the island. Mildew leads the superstitious villagers into blaming Toothless, "the unholy offspring of [lightning] and death itself", for the lightning, leaving Hiccup to find the true answers for Thor's sudden destructive anger.
Episode details and rating from TVmaze.