Louise Lombard, Peter Cambor

The ensemble for CBS' planned NCIS spinoff continues to flesh out. Not long after it was reported that Chris O'Donnell and LL Cool J are circling two lead roles, three other characters have been cast.

Louise Lombard, who played CSI's Sofia Curtis for three seasons, has landed what is considered the series' female lead: Clara, a former major in the military police turned investigator.

The Hollywood Reporter also reports that Peter Cambor (Notes from the Underbelly) will play Nate, a quick-witted operational psychologist.

Lastly, Daniela Ruah (a newcomer to American television) has been cast as Kensi, a young investigator specializing in forensics and criminology.

Should O'Donnell and LL sign on the dotted line, they will fill the roles of Callen, a "human chameleon," and Sam, a former U.S. Navy Seal, respectively.

Just as NCIS was born of a JAG episode, this latest offshoot will kick off as an episode of NCIS.