Isobel wants OA to ask an old Army friend for information regarding a private veteran's club in New York City that is connected to government agency bombings.
The team looks for a shooter who chooses detectives from the same individual precinct and unit; Tiffany discovers that she could have an unintentional bias.
Team Scorpion agrees to help locate an aircraft in the notorious Area 51 Air Force base in order to help fund Walter's research into multiple sclerosis.
Team Scorpion is forced to break into the United Nations in order to help assassinate a dangerous arms dealer; Sylvester ensures Megan's wishes are fulfilled.
While visiting Megan in the hospital, Team Scorpion is quarantined due to a lethal fungus outbreak that threatens to contaminate everyone inside the building.
Tommy attempts to reign in her officers as they seek revenge for the death of one of their own; the mayor is threatened by a recently arrested acquaintance.
Prentiss and J.J. are confronted with critical choices regarding their future as the team visits Beaumont, Texas, to examine the deaths of multiple businessmen.
Dr. Reid suffers from hallucinations from a brain injury in which ghosts of his past visit him; the team makes a discovery about how Lynch has affected Rossi.
Several candidates are considered for a vacant position at the BAU; the team searches for a killer who drops clues that indicate they are seeking vengeance.
The BAU team searches for an Unsub who may have suffered from a sudden rejection after brides-to-be are found murdered in Savannah on the eve of their weddings.
An outbreak of the bubonic plague leads the New Orleans team to collaborate with Special Agent Tony DiNozzo in order to identify which sailors are infected.
The team helps the parents of a kidnapped young girl work around a dangerous debt; Maggie is distracted by the case after her sister comes back from rehab.
On a seemingly normal day going into work with Jubal, Rina is seriously injured, and the team discovers that Vargas has been organizing a revenge campaign.
A rash of jewelry store thefts end in a double homicide and the investigation to find the perpetrator uncovers a connection to a teenager in foster care.
A college co-ed goes missing and is feared to be abducted, so Jubal focuses on getting any information he can from the father of the abductor's previous victim.