While women are being secretly relocated and moved off the base for their own safety, Jonas and the team must unravel an assassination plot against the vice president and president elect.
The team follows a scientist on a commercial flight who they believe will be the next target of terrorists they hope to link to a presidential assassination plot at the same time as their wives are relocated and given new identities back home.
Jonas vows to help save a group of girls who are being trafficked as sex slaves by the man he hopes will lead the team to a nuclear weapons smuggler they are trying to find.
Bob is undercover as a scientist when he's kidnapped by a drugs cartel. They want him to help them to disguise cocaine. Mack is als undercover somewhere as a prizefighter.
A nuclear scientist insists on making a deal with the team before he will reveal vital information about a terrorist attack in a major U.S. city.
Back home, Molly, Kim and Tiffy are drafted into service to work undercover with Jonas
The team produces fake evidence of an attack to con a terrorist into exposing his accomplices before the truth comes out and they can get away.
Mack wants Tiffy to reveal details about her relationship with Ryan.
Part 1 of 2. Jonas' daughter, Betsy, is kidnapped in Iraq, and he and the team go in to rescue her.
Back at home, Mack plots his revenge against Ryan for having an affair with Tiffy.
Part 2 of 2 Jonas and the team attempt to rescue Jonas' daughter, Betsy, from her kidnappers. Back at home, Mack has a chance to carry out his revenge against Ryan for his affair with Tiffy.
Jonas and his team attempt to keep a truce intact between two warring Afghanistan tribes by delivering a bride to her groom, but it requires going through enemy territory.
Back at home, Bob and Kim try to expose a man who may be linked to terrorists.
Who you going to call...the team is about to bust a anthrax lab with a leader with field experience but they are being held up by an official who is using high-tech toys to make decisions for him.
Kim's life is in danger when her boss forces her to do something she doesn't want to do.
Jonas and the team trick an arrogant Department of Defense official, who jeopardized a previous mission due to his lack of field experience, into joining them on an assignment so he will observe war up close and personal.
At home, Kim is secretly reunited with her kids.
Jonas plays a game of high stakes no-limit texas hold'em to win back the services of a CIA spy who has gone over to the other side. His success is also the key in getting court martial charges against team member Bridget Sullivan dismissed
Jonas and a seriously wounded Mack take refuge in a monastery where he is ordered to steal the monks' most prized possession.
Back home, Bob is asked to perform a dangerous mission that will reveal the darkest side of his job to Kim.
The President orders the unit to capture a Nazi war criminal from his hiding place and deliver him to The Hague.
In Washington, Tom Ryan confronts his past when he is offered a promotion to General.
As Jonas coaches Betsy before her military-ordered media tour, the Unit initiates a new team member.
Unable to communicate with the outside world, the Unit and their families must survive when a deadly gas poisons anyone in their community who steps outside.
As the Unit fights to rescue Jonas's old friend, a broken helicopter gas tank and nearby guerillas impede their mission.
Tom goes to extreme measures to extract information from a recovering alcoholic whose husband may have been behind a terrorist attack.
The mission's plans go awry and Bob must run interference when Jonas and Mack are undercover to find the terrorists who killed the Vice President.
When Sam attacks Bridget, the other members of the Unit must hunt him down.
A random incident throws Jonas and Bob's carefully planned mission into chaos.
While Jonas is tracking down a Russian terrorist cell, a kidnapped Molly is used as bait.
As you cloud see on the last episode Sam is involved in the kidnapping of Molly. What will happen and how will it finish.
The Unit must locate and diffuse three sets of dirty bombs headed for unknown locations across the United States.
Meanwhile, the team prepares for a wedding of one couple (Charles Grey & Joss Morgan) and the end of a marriage for another (Jonas & Molly Blane) or will Jonas leave The Unit and stay married.
Songs: Sonya Kitchell -- Soldier's Lament