A series of murders in San Francisco bearing the tell-tale signs of the infamous Zodiac Killer have the BAU wondering if the notorious serial killer has returned. Also, Reid ponders if he should be doing more with his genius abilities

Bludgeonings in Philadelphia have the team investigating the boxing world in the city; and Hotch connects with an attractive triathlete while they train together

A mass suicide among young cadets at a military academy is investigated; and Hotch and Morgan clash when it looks like a member of the team is in danger

In a personal case for Garcia, the agents search for Garcia’s missing friend whose daughter disappeared seven years earlier

The bodies of boys are found in the aftermath of storms that hit Kansas, and the team travels to Wichita to investigate the deaths

The team goes to Angeles National Forest in California when bodies are found in the mountain lakes there; and Rossi has to make a tough decision regarding his ex-wife.

The BAU team investigates the abductions of young children with troubled mothers in St. Louis. Also, Rossi reconnects with his first wife who has shocking news for him

Survivors of a Boise high school massacre return to remember the event 10 years later, but the BAU team is called in when a new killer with a similar style targets the survivors. Also, Hotch is worried that his son, Jack, may be a victim of school bullying

The BAU team investigates a mass murder at an Internet security company in Charlottesville, Va., but clues reveal it is not a typical serial killer at work. Also, Prentiss must complete recertification training under Morgan’s watchful eye

The BAU team searches rural Oklahoma when women are being found murdered after being robbed of one of their five senses. Also, JJ and Prentiss get the cold shoulder from Reid as he deals with their deception about Prentiss’ presumed death