The third season of The Unit started on September 25, 2007, with a hiatus, which ended in the season being cut short, occurring after the 11th episode due to 2007–2008 Writers Guild of America strike.
Ten days after the shut-down of the Unit, the situation for Alpha Team has grown dire. While Jonas tries to uncover why his team has been targeted, he’s hunted by a deadly assassin.
The members of the Unit find they are being hunted and discredited because they are in possession of a catastrophic state secret.
The Unit is reconstituted and ready to resume operations. Out in the world, an old, possibly leaking nerve agent bomb has been stolen from a nearby military arsenal.
Subsequent to violence and threats against the American Embassy in Cote D’Ivoire, Abidjan, Bob, Hector and Mack are dispatched to collect key remaining American personnel and their families.
Jonas, Mack and Williams must recover a chip that identifies three men who are undercover on the inside of a terrorist network. They must get the chip before it gets into the hands of the wrong people.
Jonas, Mack, and Grey discreetly smuggle a package inside the Green Zone in Iraq. When the tarp is ripped off the package, a young pop princess jumps out and begins a rock performance on stage.
During a rescue mission, Charles Grey is critically wounded. Unable to get out, our team is trapped in an apartment building as Jonas and Williams try to perform battlefield surgery to keep Grey alive.
Jonas seeks revenge for the murder of his fallen colleague as the Unit has to keep moving forward on another mission. The team embarks on a new assignment when Bob Brown has to deal with a rescued journalist.
Grey goes undercover to infiltrate a Hispanic street gang serving in the United States Army. The gang has been stealing weapons from a California base.
The team prepares to execute a sniper mission in the small nation of Montenegro. But the mission causes Bob to wrestle with his conscience as he finally confronts the moral implications of the deadly acts.
A Russian scientist and a British 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.