We have already seen the 2 previous parts of this movie and they were great. The action involved in this movie was taken to next level in the 2nd part in the climax part and it was felt as awesome by everyone.
Now let us come to the latest part.
We know the title of the movie is Hidden world. When hiccup and astrid finds this hidden world you will see a lot of dragons and it would be the best scene of the movie. Hiccup and all his friends has new suits made up of dragon scales. The villain in this movie was shown to be fearsome and ruthless but the way he dies is not that appalling or I would say he got killed easily atleast in my view as it didn't involve much fight between him and hiccup. You will see some small dragons of which gobber is afraid of and they add some hilarious fun to the movie. Tuffnut and Ruffnut too ads a dose of comedy throughout the movie where Ruffnut makes comedy with the villain and Tuffnut with our Hiccup.
I am not revealing the story just to make sure that you enjoy the movie well. This movie has comedy, a little dose of action, superb places to see, some sentimental scenes between Hiccup & Nightfury and by the way new looks of all the characters.
The ending would be wonderful as you will see Hiccup and Astrid get married and even have 2 children. By the way Night Fury too has children.