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I have a 5 year old nephew who is crazy for Marvel. He sat through Iron Man 1 & 2(even saying he felt Iron Man 1 was better) just fine but I previewed them in the theater before sitting with him at home. This would be a hard question for adults but is there any reason, besides violence and language, that is is PG-13? Basically, is there any truly horrific monsters that could cause nightmares? He can handle robots fighting but truly disgusting monsters could keep him up at night. Thanks for your he