Kate is a young woman subscribed to bad decisions. Her last date with disaster? That of having accepted to work as Santa's elf for a department store. However, she meets Tom there. Her life takes a new turn. For Kate, it seems too good to be true.
As Hiccup fulfills his dream of creating a peaceful dragon utopia, Toothless’ discovery of an untamed, elusive mate draws the Night Fury away. When danger mounts at home and Hiccup’s reign as village chief is tested, both dragon and rider must make impossible decisions to save their kind.