Five years have passed since Hiccup and Toothless united the dragons and Vikings of Berk. Now, they spend their time charting unmapped territories. During one of their adventures, the pair discover a secret cave that houses hundreds of wild dragons -- and a mysterious dragon rider. Hiccup and Toothless find themselves at the center of a battle to protect Berk from a power-hungry warrior.
To save her father from certain death in the army, a young woman secretly enlists in his place and becomes one of China's greatest heroines in the process.
A young linguist named Milo Thatch joins an intrepid group of explorers to find the mysterious lost continent of Atlantis.
