'Grimm': Amy Acker to guest star as 'Black Widow'

amy-acker-getty.jpgWelcome back old friend. Friday night's haunting NBC procedural " Grimm" is bringing in Amy Acker for a guest starring role in an upcoming episode.

TV Line is reporting the series has signed the former " Angel" and " Dollhouse" actress to guest in the show early next year. Her character will have the ominously name of the Black Widow.

The report states that Acker's character will have a disease where she ages rapidly, but if she sucks the life out of three men, she can retain her youthful appearance. Creepy!

Acker worked with producers David Greenwalt and Jim Kouf on "Angel," so it's no surprise that they'd bring her over for a spell.
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