Grimm Exclusive: Mary Elizabeth Mastrantonio to Appear in Season Finale as [Spoiler]

Former Law & Order: Criminal Intent captain Mary Elizabeth Mastrantonio has signed on to guest star in the season finale of Grimm, TVLine has learned exclusively.

The actress — a 1987 Oscar nominee for her supporting role in The Color of Money — will play the intriguingly-monikered Woman in Black, the latest obstacle for Nick and Hank.

Exclusive Grimm Video: Meet Catman!

Grimm, which has already been renewed by NBC, is set to close out its freshman season on May. 18.

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