The Unit is a covert team of U.S. Special Forces operatives who must undertake missions around the world. The latest newcomer is Bob Brown who joins Jonas' team and they set out to rescue an airliner filled with European businessmen who have been hijacked by terrorists. Meanwhile, Bob's wife Kim is struggling with how much control the Unit has on her own personal life.

Jonas attempts to rescue a group of American missionaries in hiding in Indonesia. However, he soon realizes the mission is going to take more manpower then he expected. At the base, Mac ends up being shot by Bob during a training exercise and Molly, Kim and Tiffy prepare to host a visiting senator.

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.

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.

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.