Another woman of substance is about to enter Leroy Jethro Gibbs’ orbit on CBS’ NCIS — and what’s more, he’s going to need her badly. ER and Doctor Who vet Alex Kingston has been cast in a November sweeps episode of TV’s most watched drama series as Miranda Pennebaker, a “woman of questionable morals,” series boss Gary Glasberg tells TVLine exclusively.

Pennebaker, Glasberg previews, “deals in everything from high end weapons sales to priceless gems. Her connections go all the way up the ladder of D.C. politics, and Gibbs needs her for this very disturbing, emotional case.” In fact, Kingston’s character proves so valuable, she is already being eyed for an encore. ” I’m a huge fan of Alex’s and she embodies everything I hoped for from this character,” says Glasberg. “Heck, you might even see her again.”

In addition to her runs as Doctor Who‘s River Song (who resurfaced just last Friday) and ER‘s Dr. Corday, Kingston’s TV credits include Upstairs, Downstairs, Law & Order: SVU, Private Practice and FlashForward. NCIS of course airs Tuesday at 8/7c, where this week it repeated as the night’s most watched and highest-rated program.

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