Hiccup a young viking who is less than viking-like wants to fit in with the village so he sets out to hunt and capture the deadliest dragon known to man.
He later realizes that it's his difference that make him special and great.
Also, the dragons behave like cats. This resulted in feelings of disappointment toward my tiny, wingless cat. I know it's not her fault but it would be great if she just started flying or something.