A behind-the-curtain exploration of the musical stage show “Wicked,” about the relationship between the good and wicked witches of Oz before the arrival of Dorothy Gale. Included: rehearsal clips and interviews with the cast, including Carol Kane (Madame Morrible), Kendra Kassebaum (Glinda), Stephanie J. Block (the Wicked Witch) and David Garrison (the Wizard). Laurie Osmond directed.