After an uncharacteristically lackluster installment Tuesday (follow the link for our NCIS: LA review of "Dead Body Politic"), the show returns next week with the first half of a major Sam-centric story arc.

When a CIA agent who worked with Sam Hanna over eight years ago seeks his help and is soon discovered dead from an apparent suicide, both Sam and Callen suspect foul play and a bigger conspiracy at work.

From the looks of it, this episode peels back a major layer of LL Cool J's character.

Meanwhile, on a lighter note, CBS' episode synopsis indicates that Deeks finds his inner “dog whisperer” with Kensi as the two go undercover and enter a dog show with a prized poodle. Should be great.

Watch CBS' promo for the intense-looking "Out of the Past, Part I" here ...

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.