"Nature of the Beast" -- After spending months tracking down his target, Tony is left with the blood of an NCIS agent on his hands and it's up to Gibbs to help him put the pieces of the puzzle together, on the ninth season premiere of NCIS, Tuesday, Sept. 20 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured: Guest star Scott Wolf Photo: Sonja Flemming/CBS ©2011 CBS Broadcasting Inc. All Rights Reserved NCIS

"Nature of the Beast" -- After spending months tracking down his target, Tony is left with the blood of an NCIS agent on his hands and it's up to Gibbs to help him put the pieces of the puzzle together, on the ninth season premiere of NCIS, Tuesday, Sept. 20 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured: Guest star Scott Wolf Photo: Sonja Flemming/CBS ©2011 CBS Broadcasting Inc. All Rights Reserved NCIS