SWAT tackles a mission with personal ties for Hondo when they race to find a group of missing students and their bus driver, Hondo’s former high school football coach. Also, Hicks has reservations regarding Hondo’s new 20-Squad team addition, Devin Gamble, a cop with a family background deeply entrenched in crime.

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.

The team faces a prison hostage situation, only to be thrown into deeper danger when a bomb explodes, freeing maximum-security prisoners from their cells, including someone with a personal grudge against Hondo.

A blackout throws the city into chaos, forcing 20-Squad onto the streets for an emergency patrol day, which quickly escalates when Hondo and team uncover a terror threat.

Tan is left reeling when his girlfriend is kidnapped, and 20-Squad must race to track down a violent cartel leader who may be behind the abduction.