The team hunts for a band of criminals re-enacting the crimes of the infamous Symbionese Liberation Army; Hondo experiences discrimination from a fellow officer during a SWAT training seminar for local law enforcement in Arizona.

The SWAT team races to find a stalker pursuing Tiffany, a social media star, after the dangerous admirer turns a fan event into a shootout that endangers Jessica.

When the team is called into work on their day off to end a hostage situation, they discover one of the captives is a wanted felon; Hondo saves his sister after she's given a roofie at a nightclub.

The SWAT team must recover DNA evidence kits stolen from a crime lab and bring in the crew responsible; financial strain at home makes it difficult for Deacon to focus on his role as leader of the SWAT division's annual holiday toy drive.

The team faces difficult reminders of a past school shooting when they receive a warning that a copycat plans to re-enact the crime; as the team races to stop the new threat, they flash back to the day of the tense first mission.