Joining returning stars Luke Pasqualino, Tom Burke, Santiago Cabrera and Howard Charles for the show’s second series, Warren will play the Comte De Rochefort.
His character is described as a man nursing many secrets and a very dark past.
As the series progresses the true nature of his plotting is revealed and everyone around him is drawn into his sinister web. Ultimately, only the Musketeers and their loyal allies and friends stand between him and a desperate act that will change all their lives forever.
Warren says: “I’m delighted to be part of the BBC’s stylish and exciting take on the Dumas classic. Once I’ve overcome my fear of horses I’m sure it’ll be a walk in the park.”
BBC executive producer Jessica Pope said the production team “Were thrilled to welcome Marc to the cast.
“He’s a clever and mercurial actor who will bring danger and charm to the role of Rochefort in equal measure.”