Jason Priestley provides the voice of the Cowardly Lion in this charming animated prequel to “The Wizard of Oz.” Here, the amiable lion must battle the Wicked Witch (Lynn Redgrave), who seeks a magical flower that will expand her evil power. Along the way, the lion encounters a girl named Wimsik (Jane Horrocks), a toy (Bob Goldthwait) and a balloonist (Dom DeLuise).