Runaway

Part 1: Hiccup runs away with Toothless when Gobber announces that he will be killing the Monstrous Nightmare. Three years later, he flys back to Berk when he finds out one of his mortal enemies plan to invade it and kill everyone he loves. Will he succeeded? How will the village react?
Part 2: It's been two years since with war with BloodFury but now they have a new threat to the dragons, Drago Bludvist and Hiccup has to stop him. Along his journey he finds out his mother is still alive and is the one who has been attacking Drago, however Valka has been getting help with this...who could it be?