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 unhappy crew who leaves no witness alive.

20-Squad faces down 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 unhappy cartel leader who may be behind the abduction.

When back-to-back shootings at women's clinics leave two healthcare providers dead, Hondo and the team investigate whether the shootings were politically motivated.

When two students are brutally attacked, 20-Squad contends with a possible honor hugging. Meanwhile, Hondo and Nichelle have their first parenting dispute while searching for a suitable daycare.

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.

When Hondo learns there's a 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 SWAT academy.

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

20-Squad races to find a missing child who was abducted from her front yard. Also, Hicks is faced with a difficult decision concerning Gamble.

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.