who plays jackson gibbs on ncis?
Ralph H. Waite
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 " Sleepless " marked the first on screen appearance of Steven Williams as Fox Mulder 's new source , " X. " The character was originally intended to be a woman , and an actress was cast in the role , but after shooting her first scene the role was recast with Williams , an actor who had previous experience with writers Glen Morgan and James Wong . Natalija Nogulich , the actor who originally earned the role , was replaced because the writing staff felt she was not able to create the " right chemistry " between her co @-@ stars . 

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 NCIS follows a team of government agents who work for the Naval Criminal Investigative Service . The main cast includes Mark Harmon as team leader Leroy Jethro Gibbs , Michael Weatherly as Senior Agent Anthony " Tony " DiNozzo , Cote de Pablo as Mossad Liaison Officer turned NCIS Agent Ziva David , Pauley Perrette as Forensic Specialist Abby Sciuto , Sean Murray as Special Agent Timothy McGee , David McCallum as Autopsy Technician Donald " Ducky " Mallard , Rocky Carroll as NCIS Director Leon Vance , and Brian Dietzen as Medical Assistant Jimmy Palmer . 

contradiction
 In January 2012 , it was announced that Kevin Weisman would appear in multiple episodes of Awake . This is Weisman 's second appearance on the series as Ed Hawkins . Other guest stars included Laura Innes as Tricia Harper and Daniela Bobadilla as Emma . 

contradiction
 In August 2015 , it was revealed that the character Whitney Frost would appear in the season , and Currie Graham was cast as her husband , Calvin Chadwick , the owner of Isodyne Energy . In October , Wynn Everett was revealed to be cast as Frost ; Reggie Austin was cast as physicist Jason Wilkes ; Lotte Verbeek was cast in the role of Ana Jarvis , the wife of Edwin Jarvis ; and Kurtwood Smith was revealed to be recurring as Vernon Masters , a veteran of the War Department . The next month , Ken Marino was cast as Joseph Manfredi , leader of the Maggia crime syndicate . Additionally , Matt Braunger was cast as SSR lab tech Aloysius Samberly , and Rey Valentin was cast as SSR Agent Vega . 

contradiction
 Timothy Olyphant as Thomas Gabriel , a former U.S. Defense Department analyst who leads a group of cyber @-@ terrorists systematically shutting down the entire U.S. infrastructure . Olyphant filmed his role within three weeks . 
