Ray Mabus, Mark Harmon and Madeline Carroll, NCIS

The United States Secretary of the Navy will make a guest appearance on an upcoming episode of NCIS, TVGuide.com has learned exclusively.

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Secretary Ray Mabus will appear in the Nov. 24 Thanksgiving episode entitled "Child's Play," a rep for the show tells us. Mabus will play an NCIS agent.

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In the episode, Gibbs (Mark Harmon) and the team have to put their Thanksgiving plans on hold when the investigation of a dead Marine leads them into the life of a 12-year-old prodigy (Madeline Carroll), who may be the killer's next target. Lisa Sheridan (Invasion) and Francis Capra (Veronica Mars) will also guest-star.

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Although Mabus won't be playing himself, NCIS has featured a secretary of the Navy character on the show before. Jude Ciccolella (24) portrayed the secretary in three episodes last season.