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After a truck filled with armor-piercing rifles is hijacked, the team works to discover who stole it, and what they have planned for the stolen weapons; a friend from OA's past returns to help with the case, but OA isn't sure he can trust him.

After the police ignore a desperate father's plea for help, he abducts a billionaire's daughter and holds her hostage in a safe room until his own missing child is returned to him; Jubal puts his hostage negotiation skills to the test.

When the team is called to the scene of a murder, it quickly suspects political motivation; Maggie contemplates a decision that could affect her entire career.

Jess LaCroix and his team come to help OA find a fugitive LaCroix arrested years ago after a bus with 26 students goes missing and he's the main suspect.

When Walter is accidentally launched into space in a rocket, Team Scorpion must find a way to bring him home before his oxygen runs out.

A boy from Ralph's class goes missing after having a run-in with a deadly criminal; Toby comes closer to discovering the identity of Happy's husband.

A simple job at the Los Angeles Natural History Museum turns deadly when thieves steal things from a rare gem exhibit to get the materials they need to make a nuclear bomb.

Team Scorpion explores a deep cave system in an effort to prevent a bat population from harming the North American ecosystem; the team dons Halloween costumes for Walter's impending immigration inspection.

On election day, someone tries to create turmoil in the U.S. presidential election, and Team Scorpion is called to investigate.

While in Ireland for Megan's one-year memorial, Walter discovers a natural disaster at a nearby lake has created a poisonous cloud that threatens an entire village; Cabe and Toby try to ease the tension between Tim and Walter.

The BAU is called upon when bioterrorism is suspected in a series of mysterious deaths; Garcia visits her stepbrother to take care of a difficult family issue.

The BAU is called to Taos, N.M., when someone targets victims' temporal lobes.

The team questions the credibility of a former FBI agent's bizarre account.

When Reid and Garcia are abducted by a mass murderer, it's up to the rest of the team to find them; the BAU looks to their past to solve why the two heroes have been targeted.

The team tracks a serial killer when remains of numerous victims are found in the walls of an elderly couple's home; the hunt becomes urgent after the BAU learns the killer's specific ritual of when to strike; Rossi reconnects with his ex-wife.

Packages with gruesome contents are delivered to six people in the Washington, D.C.. area; Simmons and Kristy struggle to connect with their son, David, who is suspended from school for aggressive behavior.

Soon after the BAU steps in to help local law enforcement isolate a suspect for a murder, a second person who is related to the first victim is killed under similar circumstances; Prentiss is concerned about Garcia's behavior.

The BAU investigates a spooky local ghost story of the "Tall Man" and the clues it provides when two people go missing in the woods; a third person mysteriously surfaces the following day with limited details as to what happened to her friends.

A Navy captain is murdered during an appearance on a local radio show; Pride's daughter comes home to talk about her plans for the future.

Agent Brody sees a connection between the case of a sailor struck by a party bus and the death of her sister; the team gets ready for the city's St. Patrick's Day celebrations.

After Pride's daughter is attacked on campus, the team finds a surveillance van loaded with pictures of the special agent's every move.

The team investigates when a Navy lieutenant is murdered during a traditional funeral procession in the French Quarter honoring the recently deceased.

The team investigates a drug deal gone bad after the body of a college student is found; Detective Hailey Upton temporarily joins the team and finds her investigative methods clash with the Bureau's more buttoned-up environment.