One day, while out on a mission to kill a dragon, Hiccup shoots down a Night Fury dragon but is unable to kill it. The dragon, whom he later names Toothless, is severely injured and Hiccup decides to nurse it back to health. As Hiccup and Toothless spend more time together, they form an unlikely bond.

The movie is set in the Viking village of Berk, where dragons frequently attack and burn down houses. The Vikings, led by Chief Stoick the Vast, have been trying to fight off the dragons but with little success. Hiccup, the son of Stoick, is an outcast among his peers due to his small stature and lack of fighting skills.

The film features stunning animation, with beautifully rendered landscapes and characters. The dragons are designed to be both fearsome and endearing, with unique characteristics and abilities. The animation is fast-paced and action-packed, making the film an exciting ride.

"How to Train Your Dragon" is a heartwarming and action-packed animated adventure that has become a modern classic. With its stunning visuals, engaging characters, and themes of friendship and acceptance, it's no wonder the movie has gained a loyal fan base. For those looking to watch the movie in full HD with Vietsub, there are several options available, both online and offline.