”Are you a good witch or a bad witch?” Glinda asks Dorothy when they first meet in The Wizard of Oz. In the classic movie, it was a simple dichotomy. But in Sam Raimi‘s prequel Oz the Great and Powerful, which traces the origin story of the Wizard (James Franco) and is due out on March 8, 2013, nothing’s so clear-cut. Franco’s character gets caught up in local politics, including having to determine which of the realm’s three witches — Theodora (Mila Kunis), Evanora (Rachel Weisz), and Glinda (Michelle Williams) — can be trusted. Of course, some things should never be messed with, like Glinda’s mode of transportation: the bubble. And with special effects far more sophisticated than they were in 1939, we can expect to see some sweeping scenes of flight — particularly now that the bubble’s no longer just a single-occupancy vehicle. ”In 3-D, the bubble ride to Glinda’s kingdom will look especially impressive,” says Academy Award-winning production designer Robert Stromberg (Avatar, Alice in Wonderland). ”And it’s a good opportunity to get a glimpse of Oz from a bird’s-eye view.” Stromberg says Glinda’s kingdom will be ”very art nouveau and feminine,” in contrast to the other witches’ respective kingdoms. And while we already know that Glinda will survive until Dorothy’s arrival, maybe we’ll finally find out how she ended up so cheerful.