Well okay, they didn't quite ruin it, it's still the best series finale ever.
But it's still a series finale. If anything, season 9 is at least a spin off, I do not and will never count it among the main series.
Also it doesn't exist.
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~Halo Now you learn the mistake of challenging me.
http://img408.imageshack.us/img408/2734/hieis.jpg