Michael Vartan, who last starred as Madonna’s ex in “The Next Best Thing,” has landed the role of Sir Lancelot in the TNT two-part mini “The Mists of Avalon.” Pic, based on Marion Zimmer Bradley’s bestseller, retells the story of Camelot. Mini stars Anjelica Huston and Julianna Margulies. Vartan is repped by Tracy Brennan and Ron West at ICM and manager Stephen Hanks.

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