''Snow White: A Tale of Terror'' showcases Sigourney Weaver's skill

It ain’t easy doing the Brothers Grimm in this empathetic age, but Sigourney Weaver has the craft — the stagecraft — to make a twisted and scarily desperate woman of a fairy-tale witch. While director Michael Cohn gets wobbly performances from the younger players, and the scenes of supernatural violence have no more dramatic force than a dustup on Lois & Clark, the R-rated Snow White: A Tale of Terror is worth the wading for adults — and much too disturbing for kids — because Weaver’s lordly stepmother is so passionately cold. The crowning scene comes when, egged on by her mirror, she sheds her skin to reveal the joyously evil sorceress within. Suddenly sweet — a grandma saying ”Boo!” — she materializes next to Snow White, chats, laughs, sings to herself, polishes her apple, and beguiles the maiden with one word: ”Delicious.”