A Couple of Movies
I think Edgar Rice Burroughs' vision of Barsoom (Mars), while it is scientifically non-sense, was far better than his better known Tarzan.
Elfquest a movie?
I also note that Richard and Wendy Pini's Elfquest is supposed to be in the process of becoming a movie but it has been on the back burner for years. That is really too bad. Apparently it is moving forward but some people want it so bad that they made their own trailer. This is unofficial and attractive and done to encourage the producers to hurry up. Warning: This seems to concentrate only on the female elves (There were roughly equal numbers of male and female elves in the actual story) and suggests things that were not in the books/comics.