Mad Men's Jared Harris Joins Sherlock Holmes 2 Cast

Jared Harris, who plays the delightfully prim Lane Pryce on Mad Men, has signed on to play the evil Professor Moriarty in Sherlock Holmes 2.

Harris joins Stephen Fry (who will play Holmes’ brother Mycroft), Robert Downey Jr. and Jude Law in the Guy Ritchie flick.

The news of Harris’ casting might come as a surprise to some, especially considering it was widely rumored that Brad Pitt would be taking on the role of Moriarty. The movie is slated to hit screens on Dec. 16, 2011.

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