His television credits include eight made-for-television movies including "Blind Vengeance" and "Justice in a Small Town"; and the television series, "American Gothic", "The Young Indiana Jones Chronicles", "Cold Case", "Matlock", "The Lazarus Man", "JAG", "Walker, Texas Ranger", "Criminal Minds", and "Prison Break". He appeared on episodes of "Ghost Whisperer" ("Delia's First Ghost", April 2007) and "" ("Who and What", November 2007). Watson also guest starred in an episode of "The Mentalist" ("Carnelian, Inc.", March 2009), and in the "Castle" episode "Punked" (October 2010). Since 2006, he has appeared as a recurring cast member on "NCIS" as Agent Leroy Jethro Gibbs's mentor and former superior Mike Franks.