5 would be young for "Jimmy Neutron, Boy Genius," and I know it's not an actual "superhero movie," but I don't think there are lots out there that'd be appropriate for a child that young.
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Whoops, just remembered that the plot is about all the parents disappearing. Not a good theme for a 4 year old.
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I have found that even G-rated movies have a lot in them that is scary or not appropriate. To me, "G" means there should be absolutely nothing objectionable (like Sesame Street...you could watch it with your great granny or your 4 year old and not be uncomfortable). Plenty of G movies have what they call "situations of peril," monsters, meanness, etc.Â