"Nature of the Beast" -- Behind the scenes coverage of CBS' NCIS scheduled to air on the CBS Television Network. Pictured: Mark Harmon (right) Photo: SONJA FLEMMING/CBS ©2011 CBS BROADCASTING INC. All Rights Reserved.

"Nature of the Beast" -- After spending months tracking down his target, Tony (Michael Weatherly, left) 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. Also pictured: Sarah Jane Morris as NCIS Special Agent Erica Jane "E.J" Barrett Photo: Cliff Lipson/CBS ©2011 CBS Broadcasting Inc. All Rights Reserved

"Nature of the Beast" -- After spending months tracking down his target, Tony (Michael Weatherly, left) 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. Also pictured: Sarah Jane Morris as NCIS Special Agent Erica Jane "E.J" Barrett Photo: Cliff Lipson/CBS ©2011 CBS Broadcasting Inc. All Rights Reserved

"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 (Mark Harmon, right) 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. Also pictured: Rocky Carroll, left Photo: Sonja Flemming/CBS ©2011 CBS Broadcasting Inc. All Rights Reserved

"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 left to right: Sean Murray, David McCallum and Brian Dietzen Photo: Sonja Flemming/CBS ©2011 CBS Broadcasting Inc. All Rights Reserved

"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 left to right: Sean Murray, Cote de Pablo, Brian Dietzen and David McCallum Photo: Sonja Flemming/CBS ©2011 CBS Broadcasting Inc. All Rights Reserved

"Nature of the Beast" -- After spending months tracking down his target, Tony (Michael Weatherly, right) is left with the blood of an NCIS agent on his hands and it's up to Gibbs (Mark Harmon, left) 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. Photo: Cliff Lipson/CBS ©2011 CBS Broadcasting Inc. All Rights Reserved

"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: Cliff Lipson/CBS ©2011 CBS Broadcasting Inc. All Rights Reserved

"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 (Mark Harmon, left) 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. Also Pictured: Guest star Scott Wolf, right Photo: Cliff Lipson/CBS ©2011 CBS Broadcasting Inc. All Rights Reserved