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 prot…

Balthazar Blake, an apprentice of the legendary magician Merlin, must train his old teacher’s successor – an introverted but resourceful physics prodigy – in the art of sorcery to prevent the return of Morgana le Fay.