Wicked is a musical that is based on the 1995 novel Wicked: The Life and Times of the Wicked Witch of the West by Gregory Maguire, which itself is based on the characters and setting of the 1900 novel The Wonderful Wizard of Oz by L. Frank Baum.
The show is told from the perspective of, and focuses on, the witches of the Land of Oz; its plot begins before and continues after Dorothy Gale arrives in Oz from Kansas. It tells the story of two unlikely friends, Elphaba and Galinda, whose relationship struggles through their opposing personalities and viewpoints, same love-interest, reactions to the Wizard's corrupt government, and, ultimately, Elphaba's private fall from grace.