Maggie goes under cover working in a bar to investigate an anti-government group that regularly gathers there; a single father on the periphery of the group begins to fear he's in danger of becoming collateral damage.

When a Muslim college student and his younger brother are murdered, the team connects with the outraged imam of OA's former mosque, who insists the victims were wrongly targeted as terrorists.

The team investigates an extremist gun group after an anti-gun lobbyist building is bombed; SAC Bashar dangles a possible promotion for OA.

When a young couple is found murdered in a New York City park after returning from vacation, the team searches for a suspect linked to the drug trade. Also, Scola turns over a new leaf when it comes to his relationships.

To aid Scola in his undercover mission to find the terrorists believed to be behind the imminent attack in New York City, Maggie calls in Remy, whose well-connected informant from a prior case may be key to moving the operation forward.

The crossover starts on FBI: International S02E16 Imminent Threat (I). It continues on FBI: Most Wanted S04E16 Imminent Threat (III).

After the president of the NY Fed is gunned down trying to help a young woman in peril, the team races to find the killer and the missing woman. Additionally, a distressing connection to one of Jubal’s past cases is revealed during the investigation, compounding the pressure on him as he also deals with his son’s school suspension.