It feels like NCIS: Los Angeles
' mole hunt has been going on for years ... because it has. By the time "Payback" ended, it was more a question of who wasn't
really CIA than who was, and while there is a loose end in Sabatino, as Hetty put it to Chegwidden, "Our mole may be dead, but we still have quite a mess to clean up."
There's a problem with ongoing arcs like this on shows where they're not done too often, such as a procedural drama like NCIS: LA. Some aspects may work well, but others don't, and that's true of this mole hunt. Carl Brown was a nobody when he was first introduced and caught in "Traitor" -- back in season 6 episode 9. That was just the beginning, and it wasn't until season 8 episode 15 that we got any true resolution.