FBI: International

What started as a simple murder investigation on federal property in New York City has turned into a manhunt for a dangerous fugitive with ties to sex and arms trafficking rings. The Joint Operations Command of the FBI New York City Field office enlists the help of the Budapest-based International Fly Team led by Special Agent Scott Forrester after discovering that their fugitive, Colin Kent has fled to Zagreb, Croatia, sending the team into a search for Kent before he disappears as OA Zidan of the New York's FBI field team joins the Fly Team to stop Kent and retrieve the information he has containing the identities of the other members of the ring while the Fly Team welcomes their newest member, agent Cameron Vo.

• This episode concludes a crossover event that begins on the season 4 premiere of FBI and continues on the season 3 premiere of FBI: Most Wanted. Missy Peregrym (Maggie Bell), Zeeko Zaki (Omar Adom "OA" Zidan), Alana De La Garza (Isobel Castille), Jeremy Sisto (Jubal Valentine), Julian McMahon (Jess LaCroix) and Kellan Lutz (Kenny Crosby) are all credited as Special Guest Stars.
• This episode marks the final appearance of Kellan Lutz (Kenny Crosby) from FBI: Most Wanted.

The team are tasked with serving a warrant against Katya Milgrava but things change after Scott and Kellet witness the abduction of her young son, David, in broad daylight in Budapest. Info from the New York Office reveal that the father, Gary Milgrave, is wanted for other crimes, and had hired a supposed Christian group from Australia to kidnap his son so he could be reunited with him in Budapest. The team and Jaeger stage a release for Gary after his arrival, before tracking him to the meet up place near a quarry. Forrester attempts to talk him down before he drives of the edge with the standoff complicating when David begins seizing. Gary's efforts to drive are stopped by Kellet who sideswipes his car. David gradually confirms that his father hit him after breaking a glass. Kellett's application to a position in New York is accepted, while Forrester hopes to eventually convince her to stay.

• Jeremy Sisto (Jubal Valentine) is credited as a Special Guest Star.

When a couple of American private detectives are attacked on a road in Switzerland, the man being shot dead while the woman escapes but is left injured after falling down a cliff area during her escape, the team investigate and discover that the couple were carrying several cryptocurrency wallets to a Swiss vault for safekeeping, the owner being American billionaire Steve Webb. Jamie and her informant are attacked when she tries to receive intel about the perpetrators, with Jamie being left wounded and hospitalized while her informant is murdered. The case quickly turns personal for Scott, while the Fly Team also learns that Webb refuses to collaborate, as he's interested only in recovering his money. This leads to him and his head of security to negotiate the perpetrators' ransom themselves, but Scott and his team manage to capture the leader, Kristian Hess. In turn for his accomplice's name, he demands citizenship for his Turkish girlfriend and her son. After they capture the accomplice, Jamie makes a recovery and decides to remain with Scott and the Fly Team rather than moving back to New York.

• Alana De La Garza (Isobel Castille) is credited as a Special Guest Star.

Lloyd Eckersley, an American founder of an illegal adult-only site is murdered in Prague, Czech Republic while filming. The Fly Team and the Czech police race to find the website's co-founder, Fred Dobbins, who's still on the run. After a car chase, they manage to corner him and arrest him, but he denies any involvement in Ecklersley' death, but hints at a deceased girl's sister, Ella Clancy, seeking revenge for her sister Kayla's death. The Fly Team finds the father in Prague as well, but quickly determine that Ella had every motive to kill Eckersley. When she is cornered by Kellett, she asks her to through away the bag containing her weapons. Ultimately her father confesses to the murder to protect her, while Kellett disposes of the weapons. Dobbins attempts to seek asylum, but the Czech quickly dismiss his request. Kellett also finds herself struggling to maintain a relationship with her mother due to the fact that she's working far from home.

• Julian McMahon (Jess LaCroix) is credited as a Special Guest Star.

When Mark Douglas, a NYPD officer assigned to information gathering in Transnistria, assaults and shoots a man at a bar, the team are assigned to find him. But as an unrecognized territory, neither the FBI or the Europol have official contacts here, but Katrin accompanies them because she does have contacts as a German officer. Mark tells them he was investigating a woman-trafficking ring and wanted to help a woman called Sabina. His NYPD contact, also his cousin, tells them Mark lost his pregnant wife in the September 11 attacks. Sabina shares a strong resemblance to her. A corrupt officer offers them a way to smuggle Mark out. They end up cutting a deal with the corrupt officer and with the help of their contact, a clean officer, arrest everyone and find Sabina with Jubal Valentine returning once again to give the team an insight into the case with the episode ending with Forrester's mother tracking him down at a bar.

• Jeremy Sisto (Jubal Valentine) is credited as a Special Guest Star.

A private jet carrying American industry businessman Greg Hutchinson is shot down over Poland, and Forrester finds himself conflicted when his mother offers information on the case, pointing him to a Russian informant from the Kremlin who is on the run. He goes rogue and heads to Pula, Croatia, to work with Jaeger's colleague Astrid Jensen to protect the informant, Pavel Novikoff. The team meanwhile discover that two hitman brothers were deployed to take out Novikoff and will stop at nothing to achieve their objective; while they also attempt to keep their ground with their new supervisor Ken Dandridge and General Finley. When the brothers arrive in Croatia, Forrester finally decides to involve Dandridge and Finley, who arranges for a pickup for Novikoff to the US. In the ensuing escape, Forrester kills one of the brothers and learns that his mother has been compromised as a double agent. He receives one last call from her, and someone raids her location before the call ends. Back in Budapest, the team arrange a goodbye party for Jaeger and as they celebrate, are unaware that the surviving brother is watching them from a distance.

• This episode marks the final regular appearance of Christiane Paul (Katrin Jaeger).

As the team meet their new Europol liaison officer, Megan "Smitty" Garretson, they find themselves deployed to Paris, France, when an American detective who was also assigned to a federal task force is murdered. They work with the DGSI who informs them that the task force was investigating an illegal weapons trafficking ring that span across Europe, the U.S. and the Middle East. Through multiple shell companies, they narrow their focus on an American middle man who supplied the weapons, and has recently ordered a truck of radioactive material to be hijacked. The hijackers are later found dead by radiation and they learn that it's going to be used for an attack in Paris by a government enforcer from a former French colony. The team utilises distraction tactics in order to subdue the enforcer and secure the radiation. Raines reconsiders his future career options and opts not to pursue management. The surviving brother that went after Pavel Novikoff, Vlad Pavlovic, tracks Forrester to Budapest, but is quickly recalled for his failed mission.

• This episode marks the debut appearance of Eva-Jane Willis (Megan "Smitty" Garretson).

The Fly Team are reunited with Katrin Jaeger when they join her in Berlin, Germany, to investigate the death of German elder Tobias Ganz, who according to a recording, was killed by an American, later identified as Paul Kennard. Kennard was adopted to the US from East Germany and has gone after former Stasi secret agents from the top elite Indigo squad, where Ganz was the second-in-command, who were responsible for his parents' death. They learn from Jaeger's mentor Simon Ballack that both deaths were staged. Kennard fails to kill another former agent, accidentally killing his wife instead. With only the Indigo director left, the team and German police race to identify them before Kennard can get to him, only to learn that it is Ballack. He tries to kill himself, but the unloaded gun prevents this. The team withholds that Kennard's parents were defected Stasi spies for his own safety. Jaeger finds herself struggling with her past growing up in East Germany, but finally puts it to rest when learning the truth about Ballack.

• This episode marks a guest appearance from Christiane Paul (Katrin Jaeger).

American architect David Laporta is kidnapped in Rome, and the Fly Team's investigation is stonewalled by the Italian police due to their internal processes. Jubal Valentine and Nina Chase from the FBI's New York Office are dispatched to Rome when a second victim, a Belarusian general, is tied to Laporta's kidnapping. Valentine's impatience with the Italian police puts Forrester at odds with the lead investigator, who decides to withdraw his troops when they pinpoint the culprit's location. After storming the residence, they find Laporta tortured and dead. Vo and Chase go after the last two gunmen, but Chase is shot in the process.