When a spree of brutal stash house robberies spills into L.A., 20-Squad must team up with the sheriff's department's gang unit to unmask a violent crew who leaves no witness alive.

When Hondo learns there’s a $1 million bounty on his head, 20-Squad must race to uncover the mysterious enemy from Hondo’s past who’s intent on revenge. Also, Deacon and Tan butt heads over Tan’s changes to S.W.A.T. academy.

While working undercover for 20-Squad, Alfaro encounters associates from a previous undercover case in Long Beach, embarking on a dangerous mission that stirs up unresolved issues from the past.

When violent robbers loot a museum vault, Hondo and 20-Squad must chase down the thieving killers before they flee the country; Tan reckons with the fallout from a SWAT Academy accident; Gamble nervously awaits the verdict of her lA investigation.