The first trailer for Sam Raimi's "Wizard of Oz" prequel, "Oz: The Great and Powerful", premiered at Comic Con. The film tells the story of how a circus magician is transported to Oz and becomes its leader. It stars James Franco in the title role. It also stars Mila Kunis as the Wicked Witch of the West, Rachel Weisz as the Wicked Witch of the East and Michelle Williams and Glinda the Good Witch. It doesn't come out until next March.