Louise Lombard, Peter Cambor 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.