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Pictured: Chris O'Donnell (Special Agent G. Callen). Callen and the NCIS: LA team confront their vengeful adversary, the Chameleon, when an undercover case ignites a deadly mind game orchestrated by the criminal mastermind, on a special two-hour season finale of NCIS: LOS ANGELES. Photo: Ron P. Jaffe/ CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.