 Back at the Emerald City , Glinda confronts the Wizard with Elphaba 's bottle , which he recognizes as identical to his own . He was Elphaba 's biological father , and the cause of her green skin . He breaks down in agony , and Madame Morrible surmises that Elphaba 's powers were so strong because she was a child of two worlds . Glinda orders the Wizard to leave Oz and sends Madame Morrible to prison for murdering Nessarose . 
