Olivia Williams as a villain? I don’t know, I find that hard to believe. She’s such a sweet, cute woman! But hey, maybe it’s time to stretch, right? According to The Hollywood Reporter, Olivia Williams (pictured, left) has joined the growing cast of Joss Whedon’s upcoming FOX sci-fi TV show Dollhouse. She’ll be joining Eliza Dushku, the show’s star, and will be playing the “ruthless and protective” woman who runs the Dollhouse where Dushku and others are stored, where their memories are wiped after each mission.

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Joss Whedon’s “Dollhouse,” from 20th Century Fox TV, revolves around a group of young men and women, aka “Dolls,” who are imprinted with different personalities for different assignments. They have no memories of their previous lives, until Echo (Eliza Dushku) begins to try to find out who she was.

Williams (”X-Men: The Last Stand”) will play the ruthless and protective Adelle DeWitt who runs the Dollhouse.

Dollhouse just keeps looking better and better…