The team is sent to Pakistan to help an undercover operative foil a terrorist attack on many cities.
On the home front, Molly and Tiffy help one of Tiffy's former students and Kim and Bob welcome a new addition to their family.
A former member of the Unit is locked up in a Bulgarian prison and Jonas and his team must go to help him escape in order to find one of the world's leading arms dealers. On the home front, the women meet a young man who hopes to be part of the unit someday. However, in order to get extra money to take care of her aging mother, Molly takes a one time recruiting job to hire the man away form the military. Needless to say, members of the Unit family are none to pleased at Molly's new job.
A mission is put on hold in South America because the team has to rescue two members trapped by snipers.
Meanwhile, the wives take on a mission of their own to help a unit widow.
The men are working on tracking down a known terrorist before he can launch an attack. At home, the women must face their own danger when a stranger approaches one of the children.
The Unit finds itself torn between saving an African dictator or innocent people when they are sent into a hospital as a hurricane hits.
On the home front, Mack and Tiffy reconnect with each other.
The team is assigned to stop of shipment of smuggled diamonds and Bob is conflicted when he sees one of the men helping themselves to the diamonds.
On the home front, Molly and Kim are raising money to help the men and women serving in Iraq. Tiffy debates the war with protesters from a local school.
Jonas and Bob, on personal time, rescues a young girl from a cult leader as a favor to an old friend.
Tiffy covers for Charlotte and finds herself in a lot of trouble.
While struggling to keep himself and his translator alive after their helicopter crashes in Siberia, Bob remembers the process in which he went through to become a member of the Unit.
Colonel Ryan becomes under scrutiny from a Congressional committee in Washington. Jonas and the team work against an oil minister in South American. On the home front, Molly works with Kim in finding a babysitter for the children.
Jonas heads off to the Democratic Republic of Georgia and finds himself in trouble.
On the home front, Mack and Tiffy are fighting her legal troubles and Colonel Ryan is going head to head with the vice president's men.
Jonas and Molly go home to celebrate the overdue presentation of George Blane with the Silver Star for his service in Korea. The celebration is interrupted by the discovery that their nephew is beating his wife. Jonas attempts to remedy his nephew's behavior by sharing memories of his father after he returned from war.
Meanwhile, Mack offers help to a jet that needs assistance to land after the pilot dies in mid flight and the jet flies into a restricted area. Piloting the jet is a former Ranger, with an alcohol problem and Mack calls Bob in to help out.
Jonas is assigned to protect an US Senator on a humanitarian mission to an Asian country. Although he has been secretly ordered by the President of the United States to meet with the former Prince who is planning a revolution against the current regime.
On the home front, Molly, Kim and Tiffy work with Jeremy in planning a surprise for Crystal.
The mission is to take control of a South Korean submarine to assist in the defection of a North Korean Scientist. The team find themselves confronted by several roadblocks. On the submarine, the South Korean Captain does not want to take orders from Jonas. On the home front, Kim has a dream that shares many similarities to the current mission. Ryan thinks that Bob told Kim about the mission and threatens to scrap the mission and wants to fire Bob.
The team is sent into Iran to set up a system that can detect Weapons of Mass Destruction. The mission goes off kilter when civilians become involved.
On the home front, Tiffy runs into a dilemma while doing her community service. Molly and Kim are helping Jeremy and are confused by Crystal's behaviors. Mack finds himself in trouble.
The team goes to New York to protect a foreign dignitary at the United Nations building. A bomb is discovered and they must diffuse it.
Molly and Tiffy travel to Vietnam to attend a War Memorial Service. A mother of a POW asks them to look for her missing son.
On the home front, Mack rejects Crystal's advances and she threatens to tell Tiffy.
The team participates in a unique competition known as the CT Games that puts them up against other Special Forces units from around the world. Things take a bad turn when one of the teams appears to be taking things too far to win.
Kim must travel to Utah to save her job and finds herself meeting an ex-lover. She spends some time getting reacquainted with him.
The Unit is sent to Pakistan to retrieve three suspected terrorists when they run into trouble with the local forces. They find a U.S. base with a small force of troops that do not respect their commanding officer. Jonas takes control of the combined group and prepares them for the impending attacks.
The Unit travels to Israel to learn some new techniques in terrorist tactics and how to defend against these tactics. Charles becomes interested in a Sergeant in the Israeli Army, yet things turn very dangerous when they go off alone together.
On the home front, Tiffy finds some WWII memorabilia and begins soul searching on what she should do with it.
Bob and Hector head to New Guinea to retrieve a black box from an Army aircraft that was shot down. The wreckage is located on sacred grounds and they need to permission of the local tribes to retrieve the item. They both must face their own battles to gain the acceptance of the tribe in order to succeed with the mission.
On the home front, when Crystal tells a reporter about Mack to get even with him for rejecting her. This action endangers the entire team as well as the National Security of the country. Mack must enlist the aid of the other Unit members to neutralize this threat.
The Unit is called in to help out the local SWAT team when a prominent school in Virginia is taken over by shooters. They must determine how to free the hostages without the students getting injured.
On the homefront, Lissy has a young man interested in her, which turns into a delicate situation as he is the son of an Officer. Kim further complicates this matter, when she defies Tiffys orders and Lissy pays the price.
Jonas and Bob travel to Belarus to try and locate a wanted man. Bob is being pressured by the CIA to change the mission parameters without Jonas' knowledge.
On the home front, when Mack comes home from a long assignment he finds evidence that Tiffy maybe cheating on him. When Mack starts investigating this theory, it takes him to a bad place.
When a Thai prince and his family visits the U.S. to enter into a deal, Mack, Hector and Charles are assigned bodyguard duty. Jonas and Bob must jump out of a plane to gain entry behind enemy lines and tag a building full of terrorists.
On the home front, Tiffy discovers that Mack thinks she is having an affair and takes steps to prevent anyone from getting killed.
The Unit faces its greatest threat when they are investigated by the Government for their actions. Each man must make his own difficult choices, which puts the entire team in jeopardy.