The Unit is a covert Special Forces team that does not exist. Their cover is the 303rd logistical studies group. They are assigned covert military operations by the President and never get credit for their actions. Their wives are also a tight group protecting their husbands. They protect their husband’s secrets and maintain their cover.
Jonas is still in hiding, Mack and Hector are still imprisoned, Charles is on the run, Bob is in Mexico, working for the CIA and Colonel Ryan is again called to answer question before a Congressional hearing.
Jonas works out a plan and the team reunites to clear their reputation. Kim is working behind the scenes to keep the CIA away from the other wives.
The Unit is back together and ready to take on their next assignment when a bomb filled with a nerve agent stolen from a nearby base is discovered to be on its way to their home. On the home front, Jonas and Molly make plans to spend time together, Mack is ordered to move out of his home, and Kim proposes a new show for the station but ends up handling a crisis.
The team travels to Abidjan, Ivory Coast to aid personnel from the American Embassy. They must get the Americans and their families out of the area. On the home front, Jonas’s daughter has enlisted in the Army and he wants to train her as well as to test her resolve.
Jonas must recover a chip containing information that could prevent a possible terrorist attack.
Mack, Charles and Jonas are assigned to protect an American musician while she tours the army camps in Iraq, while Bob is assigned to transfer a prisoner from a high-security prison.
The Unit is in Lebanon when Charles is seriously wounded. They must think and act quickly to save his life. On the Home Front, Tiffy's problems continue to build when a man attempts to tow her car. The women stand up and fight to protect her.
Jonas goes on a solo mission, enlisting the help of some local militants to hunt down a terrorist known as "The Butcher". Charles is still recovering in the hospital, Mack takes on the task of arranging Hector's final funeral preparations, with the help of the other wives and Bob has been ordered to deal with the rescued journalist. Ryan must deal with the man sent by Washington to oversee the cover story.
Charles goes undercover among gang members from his old neighborhood when it's discovered that they've been stealing explosives and weapons. Meanwhile, Tiffy gets hurt at work and Mack goes after her attackers.
In Montenegro, Bob has a moral dilemma when he disagrees with the team's mission. Tiffy discovers some information about Molly's past and decides to look into it further.
A Russian scientist and an Britsh MI5 agent are suspected of collusion. Jonas is sent to London to team up with the agent. However, things get complicated as Jonas had been engaged to the agent's wife earlier.
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 to 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 celebrate the overdue presentation of George Blane with the Silver Star for his service in Korea, but are 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 into help him.
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 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, 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 Tiffy’s orders and Lissy pays the price.
Jonas and Bob travel to Russia to try and locate a wanted man. Their only lead is the name of his prostitute. On the home front, Mack gets robbed.
When a Thai prince visits the U.S., Mack, Grey and Williams are up for bodyguard duty. In the mean time, Jonas and Bob jump out of a plane to catch a terrorist. The priorities change dramatically when Bob's parachute malfunctions
The Unit faces its greatest threat when they are investigated by the Government for their actions. Each man must make difficult choices, which may put their entire team in jeopardy.
The Unit must try to get a listening device to an agent inside the Iranian embassy where U.S., Iranian, and Russian diplomats are meeting. Many are speculating that the Russians are attempting to sell the Iranians material to make a nuclear weapon. Meanwhile at the base, Tom tries to end his affair with Tiffy but she won't listen to him and Kim notices Tiffy at a motel room and does not know what she should do.
The crew must fly to Afghanistan to assassinate a high ranking member of the Taliban. However, one of their team helicopters ends up going down in enemy territory, placing the entire crew in jeopardy. Back at the base, Molly confronts a friend and retired Unit veteran about his addiction to painkillers and Kim ends up getting a job at the local radio station.
After Bob gets his cover blown in Africa, he tells Jonas to cancel a visit a dignitary is taking to the area because of the danger. However, the official refuses and something shocking is quickly learned about why he really wants to go there. Meanwhile, Kim has an encounter while at the radio station and Molly gets offered a real estate opportunity.
Keith Soto returns to the base for a reunion and it's quickly discovered by Jonas and Col. Tom Ryan that he is a newspaper reporter who is writing an article that will expose the Unit. Jonas decides there is only one way to get him to not print the story. Meanwhile, with some help from Tiffy and Kim, Molly tracks down the woman who scammed $40,000 of the women's investment fund.
The Unit ends up detaining a former Yugoslav general who was wanted for war crimes and then allows lets the U.N. take credit for their capture. However, the criminal soon escapes U.N. custody and he is now seeking retaliation against Jonas for capturing him. Meanwhile at the base, Tiffy is convinced that Mack has decided to re-up with the Unit and she's thinking of divorcing him, and Kim is the recipient of some disturbing news.
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 who may have been targeted by terrorists, hoping to link those same terrorists to a presidential assassination plot.
While the Unit is investigating a man they believe to be smuggling nuclear weapons, they discover that he is also smuggling women.
Bob and Mac both find themselves in trouble when they each take assignments undercover. Bob as a chemist who hides cocaine by converting it to paint and Mac as a fighter trying to bust an illegal betting ring.
A nuclear scientist insists on making a deal with the team before revealing information about an imminent terrorist attack on a major U.S. city; Kim, Molly and Tiffy are asked to work under cover with Jonas.
Hoping to con a terrorist into exposing his accomplices before they escape, the team produces phony evidence of an attack.
The team travels to Iraq to save Jonas' daughter, who has been kidnapped; Col. Ryan must face the consequences for his adultery with Mack's wife.
The team keeps trying to rescue Betsy Blane from Syrian captors; Mack has an opportunity to get revenge on Ryan for his affair with Tiffy.
Jonas and the team must travel through enemy territory to bring a young bride to her groom, preserving a truce between two warring Afghanistan tribes; Kim and Bob try to expose a man who is linked to terrorists.
The team's attempts to raid an anthrax lab are thwarted by an official from the Department of Defense (Michael McKean), who believes his high-tech intelligence is superior to field logic.
Jonas and the team force a Department of Defense official to go with them on an assignment and experience the realities of war; A mysterious women shows up at Aerodyne headquarters. Kim is finally reunited with her kids.
Jonas plays a game of high stakes Hold 'em poker to win back the services of a CIA spy who has gone over to the other side. His success is also 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
The unit initiates a new team member while Jonas coaches his daughter Betsy, on how to respond to media questions about her kidnapping and rescue without blowing the cover story.
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. Meanwhile, 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.
Molly is kidnapped and used as bait, while Jonas is out of the country looking into a Russian terrorist cell.
When several dirty bombs are found on American soil, The Unit is deployed to find and diffuse. On the home front, the wives prepare for a wedding and a possible divorce.