Three years after Disney scored a $1-billion global hit with "Alice in Wonderland," the studio is back with another 21st century take on a beloved fantasy tale: "Oz the Great and Powerful," a sort-of prequel to the 1939 classic "The Wizard of Oz." The film stars James Franco as a small-time Kansas magician who ends up in an enchanted land, where he crosses paths with three witches played by Mila Kunis, Michelle Williams and Rachel Weisz.