Mila Kunis Mila Kunis

Mila Kunis has joined the cast of the Wizard of Oz prequel, Oz, the Great and Powerful, according to Variety.

As previously announced, James Franco will play a fast-talking oil salesman who flees a traveling circus in a hot air balloon and winds up in Oz, where three sisters are battling for control.

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Kunis will play Theodora, the youngest sister of three witches, who starts out as good, but is convinced to join her older sister in the war over Oz after her sexual advances on Franco's character are spurned. It's unclear what Theodora's relationship is to the witches depicted in the classic 1939 film The Wizard of Oz.

Sam Raimi will direct Oz, which was written by David Lindsay-Abaire.

The 27-year-old actress, who scored a Golden Globe and SAG nomination for her role in Black Swan, previously appeared opposite Franco in Date Night.