
Daniel "Hondo" Harrelson, a Los Angeles S.W.A.T. lieutenant, is assigned to lead a highly skilled unit in the community where he grew up. Torn between loyalty to the streets, where the cops are sometimes the enemy, and allegiance to his brothers in blue, he strategically straddles the two worlds. Hondo encourages his team to rely on communication and respect over force and aggression, but when a crisis erupts, these unflinching men and women are prepared to put their tactical training to the test.

Hondo and the team race to stop a nuclear attack on Los Angeles when radioactive material is stolen from a local lab; Powell delves into Alfaro's past when he displays a talent for boxing.

The team must race to uncover a dangerous enemy intent on revenge; Deacon and Tan butt heads over Tan's changes to SWAT academy.

20-Squad contends with a hostage crisis; Hondo receives a family visit.

The squad races to find a missing child who was abducted from her front yard; Hicks is faced with a difficult decision concerning Gamble.