The beginning
Everyone on the Isle of Berk was excited that the chiefs weak and frail son, Hiccup, was chosen to kill the Nightfury. Excluding Hiccup, of course. He was getting ready to leave, when he felt something impact against the back of his neck, and he blacked out.
When Jack Frost was riding in North's slay, he wasn't sure what he was expecting. He certainly was not expecting North to lose control of the slay. They hit the chimney of the house they were by. Everyone in the slay was knocked out, completely unaware of the grinning figure, not a mile away, holding a small, black remote with a single red button, labeled, 'Whipeout'.
Hero was in major trouble. He looked through the metal bars to the cell across from his, and meekly waved. His older brother, Tadashi, who was squashed with a bunch of bot fighters, scowled in return. Without them noticing, a light mist was filling the room. Realizing what the gas was, Hiro tried to put his sleeve over his face, but it was to late. They all passed out.