The agents of NCIS: Los Angeles will find themselves in danger from more than just the villains in this week's upcoming episode "Fallout."

When Hetty (Linda Hunt) collides with someone from her past, her current job could be on the line. Meanwhile, as the team scurries to track down a stolen antiterrorism device, their actions could put them on the wrong side of the law.

A new promo (see video below) promises that a dirty bomb could wreck havoc on both Los Angeles and the agents' careers. While Eric (Barett Foa) tries to make sense of a complicated map, Hetty protects someone with a shotgun and Sam (LL Cool J) consoles Callen (Chris O'Donnell).

Thanks to various updates from executive producer John Peter Kousakis, episode scribe Joey C. Wilson ("The Gold Standard"), and director Diana C. Valentine ("Lokhay"), viewers already have a good idea of where "Fallout" will take place.

Based on scouting photos, it is evident that some of the story will take place at Grand Park, the Los Angeles subway, the Staples Center, and an obligatory dark alleyway.

While near Grand Park, Callen and Co. will run into a bit of action. The Los Angeles Superior Court warned residents that the area would be home to live gunfire, police, and the bomb squad while the series was filming on Oct. 3, according to The Wrap.

Although there is no hints as too why Sam was giving his partner a hug in the promo, Eric will at least have a new toy to play with since the map he is analyzing gets a very cool technical facelift, according to Kousakis.

Click through the gallery above to see behind the scenes photos of the cast while shooting and a few snaps from location scouting.

NCIS: LA airs on Tuesdays at 9 p.m. on the CW.