Trevor Jackson

On her first undercover assignment, K.C. must find a teen spy and track down the code for a dangerous virus that could render all mobile devices useless; it's also the night of her school dance.

The BAU investigates victims who were documenting their personal lives and inner desires on blog posts and social media. Also, Kevin gets jealous when he learns Garcia may have a new love interest.

Ruby gets scammed and Dre begins to suspect that she isn't as sharp as she used to be, particularly because she was the one who used to scam other people. Elsewhere, Zoey's friend Aaron visits and Diane develops an instant crush on him.

Dre tearfully drops Zoey off to college for her two-day orientation, and she hits it off with fellow incoming freshman Miriam after they ditch the campus tour. When Zoey finds out that Dre never turned in her housing application, she pays a visit to President Schock and Dean Parker to plead for mercy.

While investigating the 1983 case of a tagger who died from a fatal dose of spray paint down his throat, Rush, Valens and Miller each contend with vexing personal issues.