Last month, it was reported that Mila Kunis was set to join James Franco in director Sam Raimi’s Oz, the Great and Powerful. Today, Variety confirmed Kunis’ casting, announcing that the actress will take on the role of Theodora (aka The Wicked Witch of the West). In this prequel to The Wizard of Oz, Franco will portray a traveling salesman and illusionist who is whisked away to Oz in a hot air balloon, landing in the middle of a battle between three sisters for control of the land. His character eventually becomes the Wizard we know from the 1939 film.Theodora is initially a good witch, alongside sister Glinda, but is convinced by bad witch Evanora to switch sides after being jilted by Franco’s character. Theodora and Evanora then set out on a quest to rule Oz themselves.  David Lindsay-Abaire (Rabbit-Hole) recently performed a rewrite on the script for Disney. The studio is now searching for actresses to play the other two witches in the film, with Olivia Wilde, Amy Adams, Kate Beckinsale, Keira Knightley and Rebecca Hall all under consideration.