Maggie and OA lead the search for an abducted former biological weapons chemist.

Following a frenzied attack by gunmen aboard an American-owned river cruise ship on the Danube, the Fly Team heads to Vienna to investigate why the boat was targeted. Also, Forrester…

Following a frenzied attack by gunmen aboard an American-owned river cruise ship on the Danube, the Fly Team heads to Vienna to investigate why the boat was targeted. Also, Forrester…

Remy and the team investigate the homicides of two Army veterans in a murder spree connected to their time in Afghanistan. Also, Hana receives surprising news about her birth mother.

Remy and the team investigate the homicides of two Army veterans in a murder spree connected to their time in Afghanistan. Also, Hana receives surprising news about her birth mother.

OA is forced to confront one of his biggest fears when the team discovers that deadly sarin gas may have been sold to terrorists.

OA is forced to confront one of his biggest fears when the team discovers that deadly sarin gas may have been sold to terrorists.

When a group of Americans are among the victims of a bombing at a festival in Budapest, the team is brought in to find the perpetrators before they strike again….

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. The…

OA and Maggie team up with members of the FBI’s Fugitives Department to track down a person wanted for murder who is also on America’s top 10 most wanted list.

When a domineering man and his girlfriend embark on a terrifying multi-state killing spree, the team races to find a pattern behind the deranged couple’s seemingly random acts of extreme…

Cassie comes face to face with Alex’s killer. Annie works with the FBI. Megan comes clean.

A series of unexplained deaths near Chicago in 1982 starts a nationwide panic; the victims are connected by one frightening detail: cyanide-tainted capsules of Extra-Strength Tylenol; 40 years later, it…

A series of unexplained deaths near Chicago in 1982 starts a nationwide panic; the victims are connected by one frightening detail: cyanide-tainted capsules of Extra-Strength Tylenol; 40 years later, it…

Undercover FBI agent Dana Lewis returns to help the detectives with a case.

The team attempts to extract key information from a vulnerable 9/11 widow, Hannah Thompson, who is shocked that her new “boyfriend” is the manipulative leader of a terrorist group planning…

Special Agent Maggie Bell, Special Agent OA Zidan and the team investigate the murders of 18 young women with help from a survivor associated with the deceased.

n April 1973, 24-year-old Edmund Kemper had murdered 6 coeds in and around the city of Santa Cruz, California, shaking the community to its core. But Kemper reached a breaking…

18 months after parting ways under mysterious circumstances, the FBI team is brought back together by a new crisis.

Following a successful sting, an explosion causes three FBI agents to be killed.

After taking down a terrorist, the FBI and their Fugitive Task Force partners turn their attention to the terrorist’s wife who escaped with one million dollars and is determined to…

Dr. Rhodes receives an alarming phone call that prompts him to rush out in the middle of an important surgery. Dr. Halstead comes to the aid of an FBI agent…

When the FBI takes over Firehouse 51 for an undercover mission, Casey and Severide volunteer to assist with the investigation. Kidd attempts to help Severide come to terms with recent…

Rio’s feeling the heat from the FBI investigation, so he abruptly shuts down operations, cutting off Beth, Ruby, and Annie’s money supply. Their attempt to go back to being ordinary…

The FBI arrives in Southold, complicating Jo’s efforts to find Emily. Meanwhile, Alex and Piper hunt for answers on a road trip, and the family celebrates Mia’s birthday.