Amy Acker

Grimm? Ha — this news is positively joyful!

Sources confirm exclusively to TVLine that NBC’s freshman thriller has cast Angel and Dollhouse alum Amy Acker as the fearsome Black Widow.

Just how fearsome is she?

Well, most of the time, not at all — she’s Lena, your run-of-the-mill happy housewife. But, because she suffers from rapid-aging syndrome — wait, that’s not just a soap opera thing? — every five years, she has to leech the life out of three guys in three short days in order to maintain her appearance.

What? Like your beauty regimen is so much more respectable.

Anyhow, her episode will air in early 2012, so save some of that New Year’s Eve bubbly, huh? In the meantime, feel free to weigh in on her casting below. You know you want to!