Put the candied yams back in the warming oven! Gibbs (Mark Harmon) and his team are forced to put their Thanksgiving plans on hold after the horrific death of a Marine leads them to a government think tank that employs child prodigies, where a 12-year-old might be the killer's next target. Gabriel Olds, Lisa Sheridan and Madeline Carroll guest star in the new episode "Child's Play"; Michael Weatherly and Sean Murray also star.