Sam Hanna in the May 18, 2010 episode of NCIS: Los Angeles. When a security breach compromises Callen, how will the team respond?

A security breach compromises the NCIS: Los Angeles team this week. Will Callen & Co. survive?

The OSP team hunts down a terrorist leader in "Hunted," the May 11, 2010 episode of NCIS: Los Angeles. Another solid week for the show.

G. Callen (Chris O'Donnell) in a Spring 2010 episode of NCIS: Los Angeles. This guy is the man. Even with just a letter for a name.

It looks like Dom reappears on NCIS: Los Angeles later this season! This is a photo from the May 4 episode, "Found."

Callen and Kensi (with the LAPD's Deeks) go undercover at an L.A. club in search of some perpetrators. We'll see if they get their guy (or girl)...

Deeks helps Callen and Kensi go undercover. This LAPD liaison may end up being a bigger part of the team going forward.

Kensi and Callen go undercover in "Fame," the April 27, 2010 episode of NCIS: Los Angeles. What will they uncover in the shady L.A. underworld?

These two definitely can pass for hot club-goers. The NCIS: Los Angeles team is easy on the eyes!

Callen goes undercover in the April 27 episode of NCIS. What will he find in L.A.'s seedy underworld?

G goes undercover in "Fame." What will he find in the L.A. underworld?

Kensi gets down and dirty infiltrating an MMA league in "Hand to Hand," the April 6, 2010 episode of NCIS: Los Angeles. We wouldn't bet against her.