The Echo Forest

After the train station clerk is assaulted and left bound and gagged, then the departing train and its passengers robbed, a posse goes in hot pursuit of the fleeing bandits.

Professor Barbenfouillis and five of his colleagues from the Academy of Astronomy travel to the Moon aboard a rocket propelled by a giant cannon. Once on the lunar surface, the bold explorers face the many perils hidden in the caves of the mysterious planet.

Using every known means of transportation, several savants from the Geographic Society undertake a journey through the Alps to the Sun which finishes under the sea.

It's been ten years since the dragons moved to the Hidden World, and even though Toothless doesn't live in New Berk anymore, Hiccup continues the holiday traditions he once shared with his best friend. But the Vikings of New Berk were beginning to forget about their friendship with dragons. Hiccup, Astrid, and Gobber know just what to do to keep the dragons in the villagers' hearts. And across the sea, the dragons have a plan of their own...