Why was Callen targeted by a shooter months ago? He finds out the reason during the episode "Pushback."

Special Agent Kensi Blye flashes two fingers in this scene from NCIS: Los Angeles. She's played by Daniela Ruah.

Hello, CBS? Yes, we're a huge hit, we know. You're very welcome!

Callen and Hanna are seen here in a shot from the episode "Keepin It Real." They must determine why a marine was living a double life.

On the episode "Killshot," Callen and Hanna look into the death of a contractor. Did information he possess get lost to the wrong people?

This photo of Sam Hanna and G. Calen is taken from the NCIS: Los Angeles episode titled "Predator."

Sam Hanna needs a drink. It can be stressful to be stopping crimes and capturing criminals all day.

Callen is played by Chris O'Donnell on NCIS: Los Angeles. He and Sean Hanna team up each week on the spin-off.

More of a buddy cop show than the original NCIS, this spin-off focuses heavily on the relationship between G. Callen and Sam Hanna.

A drug dealer is killed on the second episode of NCIS: Los Angeles. The case gets personal for the team.

G. Callen (Chris O'Donnell) is seen here during the latest NCIS: Los Angeles investigation. This is a scene from "The Only Easy Day."

Special Agent Sam Hanna squats over a dead body during this NCIS: Los Angeles scene. He's played, of course, by LL Cool J.