Imagination!! LOL!
I, myself, compared this to Pocahontas. The imagination I am speaking of is the visual world they occupy and the aspects that are not in Pocahontas. I saw the comparison of the two movies a few weeks ago. The story lines are very similar and, at a high level, typical of this sort of story.
As I mentioned earlier, it is even similar to Independence day.
Heck, where do you think the phrase “does the boy get the girl” come from? :)
