You a viking kid, and child of the chief on the island berg, you are friends with a dragon. A Nightfury that you named Toothless, you keep him a secret

one day you have to and kill a dragon To become a viking. You drop your weapon, to tame the Dragon. your dad is hitting the arena, making the dragon go rampage. toothless appears and fights the dragon off. You try to fly away with him but you get held back and have to watch how the vikings beat and tie toothless to a platform