Chris O'Donnell as Special Agent G. Callen and LL COOL J as Special Agent Sam Hanna
After Operational Psychologist Nate Getz (Peter Cambor) fails to check in with Hetty while working undercover on a mission linking organized crime to terrorism, the team learns he is working with an infamous crime leader on "Head Of The Snake" (Episode 19, Season 7 of NCIS: Los Angeles).
