The Rise of the Brave Tangled Dragons is a fandom which includes Jack Frost (RotG), Hiccup (Httyd), Merida (Brave), and Rapunzel (Tangled). Thousands, perhaps millions of people want to see a movie about these four, and I'm very sure, having seen the masterpieces produced by both companies, that this would be possible. 

Ever since I heard about "The Big Four" a few years ago, I've wanted to see a movie about it. There are many short videos on youtube and memes elsewhere on the internet which depict these four meeting, fighting "bad guys", etc. There are even a few so-called "trailers".   

For myself, I think that a movie with Jack Frost, Hiccup, Merida, and Rapunzel would be not only interesting but also a lot of fun and very enjoyable for everyone, not to mention very popular and profitable.

Now, although there are certain difficulties to overcome as far as timelines go (Jack being in the modern world whereas the others are in a fantasy/old-fashioned worlds), I'm very sure that you could overcome this obstacle. 

Both Disney and Dreamworks have made many fantastic movies over the years, and both companies show very talented artists, technicians, screenplay writers, etc. 

I've read many fan-made stories about this subject, but although most of them are good, they don't quite have the appeal of a real movie. The four heroes come together, they fight off a bad guy, there are some love relationship dramas, and all in all, it proves to be very interesting and exciting, and yet, in the end it serves only to make my desire for a real movie stronger than ever. 

Please, on behalf of all fans of "Rise of the Brave Tangled Dragons", please make this movie, and make it soon!