In the season opener, Callen’s secretive, rogue investigation into “something,” showrunner Shane Brennan cryptically teases, “creates a lot of tension” between him, Sam and Hetty and will have a “fairly major” payoff midway through the season, in a double-episode event. Other fall outings introduce Deeks’ mom (guest star Pamela Reed), mark the series’ 150th episode (which features a “very funny” undercover op for Kensi and Deeks) and welcome a visit from NCIS’ Michael Weatherly (whose DiNozzo “is in virtually every scene”). Elsewhere, Eric “wants to be more of a macho man and prove himself,” Brennan says, and to that end he will (amusingly) get weapons training from Sam, while the Internal Affairs investigation that has hounded Deeks “comes to a head.”
BONUS SPOILER!: Bar Paly, who was introduced in the May finale as Arkady Kolcheck’s daughter Anna, will return “in a very unexpected way,” for a “big, big, big storyline,” Brennan shares.
source: tvline.com