Hanna is seen here in the episode "Brimstone." This is the NCIS: Los Angeles Christmas episode.

It's Christmas on NCIS: Los Angeles. The gang checks out a decorated courtyard int his photo from "Brimstone."

Are you digging Chris O'Donnell as G. Callen? He's helped carry NCIS: Los Angeles to huge ratings.

Abby visits NCIS: Los Angeles on the episode "Random on Purpose." She's tracking a serial killer.

Cheers to Los Angeles! Abby has a drink during her crossover episode, titled "Random on Purpose.'

Welcome to Los Angeles, Abby. During this crossover scene, the character sits with Eric Beal.

We weren't sure what to think of Chris O'Donnell as Callen. But he's perfect for the role on NCIS: Los Angeles.

Things look bad right now, but don't worry. Callen and Hanna will get out of it.

Callen and Hanna come across stolen missiles on the episode "Ambush." That's never a good sign.

Special Agent Kensi Blye is on a mission. She's played by Daniela Ruah.

This is a scene from "Pushback." The team is on the case of a murdered woman.

Sam Hanna discovered a murdered body on the NCIS: Los Angeles episode "Pushback." The character, of course, is played by LL Cool J.