Kyle MacLachlan

Kyle MacLachlan will guest-star on an upcoming episode of Law & Order: SVU, TVGuide.com has learned.

Inspired by former California governor Arnold Schwarzenegger, MacLachlan, 52, will play a powerful politician whose family is embroiled in a scandal. The episode is currently in production and no airdate has been set.

Stephanie March, Diane Neal returning to Law & Order: SVU for Season 13

Law & Order: SVU
will welcome two new series regulars, Kelli Giddish and Danny Pino, when it returns for Season 13 this fall.

MacLachlan is best known for his work on Twin Peaks, Sex and the City and, most recently, Desperate Housewives.

Law & Order: SVU premieres on Wednesday, Sept. 21 at 10/9c on NBC.