An ordinary LEGO construction worker, thought to be the prophesied as "special", is recruited to join a quest to stop an evil tyrant from gluing the LEGO universe into eternal stasis.
A special bond develops between plus-sized inflatable robot Baymax and prodigy Hiro Hamada, who together team up with a group of friends to form a band of high-tech heroes.
When Hiccup and Toothless discover an ice cave that is home to hundreds of new wild dragons and the mysterious Dragon Rider, the two friends find themselves at the center of a battle to protect the peace.