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.
As the team works to de-escalate a hostage situation, the mission takes a dangerous turn, which impacts the team; Street tires of his complicated romantic entanglements and agrees to let Chris make over his online dating profile.
A fake 911 call puts Hondo and the SWAT team on the hunt to stop bombing attacks; Street's relationship with his mother jeopardizes his career; Jessica is thrown a curveball by the president of the police commission.
Hondo and Jessica's secret relationship comes to a crossroads when the president of the police commission discovers their affair; Hondo and the team assist with the federal investigation to bring in an undocumented fugitive.
After a domestic bomber dies in an explosion, the SWAT team races to find the man's partner before more devices detonate; Hondo reaches out to his former team leader.
Former Marine Daniel "Hondo" Harrelson is tasked to run a specialized tactical unit in Los Angeles.