When the sun rises on Monday, Summer 2019 will officially be over. The hottest season of the year was one to forget for series like "Reef Break" and "First Responders Live" -- but neither of them were the lowest-rated show of the summer. TheWrap ranked the Big 4 broadcast networks' Bottom 12 summer series by their average 18-49 ratings, according to the "most current" data from Nielsen. Scroll through the gallery to see how they stacked up.
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