Follows the Edgar Burrough's book, Princess of Mars, but has deviations that actually in the end make it a better story line. Like the book, it makes you want to see the next movie, if there is one. Like most Disney movies, it tries to appeal to both youth and adults and does a reasonable job of it. It is not really scary despite having monstrous apes and four armed green men with tusks, so it's okay to take elementary school aged kids to this movie. The Washington Post panned the movie as bad but I didn't find it so. Acting and graphics were good and there weren't any scenes that dragged. Overall, an enjoyable movie, especially if you like Burrough's John Carter of Mars stories, which I read a long time ago, when I was ten years old.