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"Beastmaster" -- After a Marine Sergeant is found murdered in a National Park, Gibbs and the NCIS team partner with Mounted Police Sergeant May Dawson (Elisabeth Röhm) to solve a string of related crimes in the park, on NCIS, Tuesday, May 2 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured: Mark Harmon, Elisabeth Röhm.  Photo: Michael Yarish/CBS ©2017 CBS Broadcasting, Inc. All Rights Reserved NCIS: Will Everyone Survive the Season Finale?

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