I think, it would have to be Ender's Game. Without revealing too much along the story, they missed so many key moments in Ender's "childhood" I ended up turning my TV off the first time I watched it. So what is your opinion?
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Definitely Eragon the books are the best I've ever read they are amazing. Then they just completely screwed up the movie. I hope the redo it one day and try the whole series.