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Would you believe Rachel Weisz and Mila Kunis as sisters? You know, the broom-riding, flying-monkey commanding, perhaps green-skin-hued kind of sisters.

Weisz is the latest big name in talks for Disney’s upcoming Wizard of Oz prequel, Oz, the Great and Powerful — produced by Joe Roth (Alice in Wonderland) and directed by Sam Raimi (Spider-Man) — potentially joining Kunis as one of the film’s evil witches. In the story, which takes place before the classic L. Frank Baum tale, the witches war with James Franco’s titular wizard, who starts out not so great and powerful, but rather as a snake-oil huckster whisked away to the magical land.

The deal with Weisz is not yet locked, however, according to sources close to the production. Robert Downey, Jr. was expected to play the wizard at one point, but the negotiations fell through. The title is attracting interest from major talent, however, partly because of the runaway success of Wonderland, which earned more than $1 billion worldwide.

Oz, the Great and the Powerful is expected in 2013.

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