NCIS Origins is making its way to the UK with fans keen to know where the NCIS prequel was filmed. Agent Leroy Jethro Gibbs (played by Mark Harmon) had been somewhat of a mystery during his 18-year stint in NCIS before leaving the CBS police procedural to start a quieter life in Alaska. And even though CBS viewers and his colleagues alike got to know Gibbs during this period, the veteran agent preferred to keep his cards very close to his chest. But all will soon be revealed as NCIS Origins is