The abduction and brutal torture of two college football stars puts S.W.A.T. on the trail of a violent drug dealer looking to extract vengeance for a drug deal gone bad, while Deacon’s heroics bring unexpected attention on S.W.A.T.

When three of L.A.'s finest are targeted and gunned down in the street, the team enlist the help of an LAPD psychologist to stop a murderous rampage, reopening old wounds tied to the department's failed response to a school shooting.

When Hondo’s cousin goes AWOL from his Marine base during basic training, Hondo, Deacon and Daniel Sr. take a road trip to get the kid in line; Alfaro plots to work outside the law when he discovers that his mother’s abusive ex is back in her life.