Agent Martin Odum returns to the FBI after an assignment infiltrating a domestic terrorist organization; Martin tries to connect with his estranged wife and son; a mysterious stranger confronts Martin with information.

A high school chemistry teacher and his family are kidnapped; Martin, Crystal and Troy Buchannan go under cover to infiltrate the Chechen mob.

Martin assumes the legend of an international arms dealer; Martin makes contact with a beautiful arms dealer who is the right hand of a Chechen mobster.

The Colonel and Ana Paulanos are captured by DCO; the Colonel's followers release VX on a crowded bus; Martin stages a prison break, forcing the Colonel to lead him to the VX.

Martin is put on leave; Martin begins looking into his own past; Martin assumes the legend of a Southern outlaw in order to infiltrate a smuggling operation.

Martin takes Kyle Dobson into custody in the aftermath of a shootout; Martin must take his prisoner on the run when Dobson's employers send a team of professional hitmen.