Someone has been ... but not who we're led to believe. Is Callen's father still out there? Or his mother?

Chris O'Donnell as G. Callen in the season finale of NCIS: Los Angeles. The team hunts down a woman with the key to a vast fortune - as well as Callen's own past.

Callen goes off the grid to end the first season of NCIS: Los Angeles after his identity is compromised. How will the events of this episode play out?

Sam and Kensi in the season finale of NCIS: Los Angeles. The show will be back for a second season in the fall - but will all its agents?

The season finale of NCIS: Los Angeles airs May 25, 2010. Here's a photo from the exciting conclusion to the first season.

We'll learn a lot about Callen in the first season finale of NCIS: Los Angeles. Where did this mysterious agent come from?

A shot from "Burned," the NCIS: Los Angeles episode airing May 18, 2010. Will Callen be in danger?

Hetty in "Burned," the May 18, 2010 episode of NCIS: LA. Now that she's been talked out of resigning, she's got a lot of work to do!

Something tells us Sam isn't just reading the headlines here. Call us crazy.

Callen in "Burned," the second to last episode of the NCIS: Los Angeles season. He may end up on the run after a security breach compromises his identity.

Sam Hanna (LL Cool J) in "Burned." What adventure awaits our man this week?

Agents Callen and Hanna in the penultimate episode of NCIS: Los Angeles' first season. The two find themselves on the run after a breach compromises a mission.