Hondo Harrelson recruits Jim Street to join an elite unit of the Los Angeles Police Department. Together they seek out more members, including tough Deke Kay and single mom Chris Sanchez. The team's first big assignment is to escort crime boss Alex Montel to prison. It seems routine, but when Montel offers a huge reward to anyone who can break him free, criminals of various stripes step up for the prize.

Los Angeles S.W.A.T. officer, Lt. Paul Cutler, is sent to train the Detroit S.W.A.T. team on new anti-terrorism and homeland security techniques. Cutler has a hard time settling into his assignment as he locks horns with his new captain and encounters resistance from the team he must lead. Cutler begins to adjust to his new assignment, starting a budding romance with police psychologist Kim Byers along the way. Unexpectedly, a routine hostage call turns deadly, and a relentless ex-government agent named Walter Hatch vows revenge on Cutler and the entire S.W.A.T. team for killing the woman he loves. Cutler must use his considerable S.W.A.T. training and knowledge to save his teammates and defeat a trained killer.

When a D.E.A. and S.W.A.T. cartel takedown ends in a shootout, S.W.A.T. Agent Travis Hall seizes a mysterious prisoner taking him into custody. Before long, the S.W.A.T. compound is under siege by wave-after-wave of assault teams attempting to recover the prisoner known as “The Scorpion” for the tattoo blazed across his back. When Travis discovers that his prisoner is a Secret Ops double agent planted within the cartel, it’s up to him and his expert S.W.A.T. team to keep “The Scorpion” and his billion dollar secrets safe.