A spin-off of a spin-off, NCIS: Los Angeles premieres on Tuesday night.

The drama debuts after the original NCIS and stars Chris O'Donnell as the lead character of Callen. He possesses a natural talent for undercover work is legend.

LL Cool J is also on board, portraying Special Agent Sam Hanna, a former Navy SEAL. He's fluent in Arabic and an expert on Middle Eastern culture.

Take a look at a clip from the series premiere below, as well as a few photos of O'Donnell and Cool J in their roles...

[video url="http://www.tvfanatic.com/videos/ncis-los-angeles-clip/" title="NCIS: Los Angeles Clip"] [/video]

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.