User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-2.222.253.11-20130210123357/@comment-3481504-20130211010347

I don't. For one, how would they, the boys, or anyone aiding them, defeat him? Depending on how he escaped, Michael may or may not accompany him. God wouldn't do a thing, as that would defeat the purpose of a reappearance. And Death would associate with the issue, as not his problem. And two, based on the Creator's of the series own words, we won't be seeing Lucifer or Michael after the Fifth season.