Every season of Alert: Missing Persons Unit ever, ranked from best to worst by thousands of votes from fans of the show. The best seasons of Alert: Missing Persons Unit!

When police officer Nikki Batista’s son goes missing, she joins the Philadelphia Police Department's Missing Person’s Unit (MPU) to help other people find their loved ones, even as she searches for her own. Six years later, her world is turned upside-down when her ex-husband, Jason Grant, a former police officer, shows up with a proof-of-life photo of their missing boy. Or is it?

The Best Seasons of Alert: Missing Persons Unit

Every season of Alert: Missing Persons Unit ever, ranked from best to worst by thousands of votes from fans of the show. The best seasons of Alert: Missing Persons Unit!