Dragons: Gift of the Night Fury

It's the Snoggletog holiday in the Viking town of Berk. Their dragons suddenly leave. The only one left seems to be Toothless. Hiccup installs a new tail and Toothless also leaves. Later, Hiccup happens upon Meatlug who had been chained up by Fishlegs. Meatlug escapes and carries Hiccup to a secret volcanic island where the dragons are hatching the next generation.

It's a perfectly good holiday special for this children's franchise. It's a continuation rather than a new chapter. There are no real drama and there is no villain or opposition in this short. It's fine for anyone who likes the movies.