Hondo returns as leader; the team is pulled into a dangerous case involving a large stockpile of cash and the Russian mob; Daniel Sr. opens up to Hondo about a painful time in his past.
When Deacon enlists Chris' help on an off-duty private security detail, they struggle to survive when they're attacked by a drug cartel looking to kidnap their wealthy VIP client.
The team must locate stolen rocket launchers smuggled into Los Angeles.
Hondo and the team race to locate the hacker responsible for accessing LAPD's computers and revealing the identities of undercover officers; Street is forced to reckon with past misdeeds.
The team races to find a militant group that escaped capture months earlier; now, the criminals take hostages in exchange for a $500 million ransom from corporations they deem corrupt; Hondo's emotional turmoil begins to affect his leadership.