Elphaba Thropp, the misunderstood green-skinned girl
(Gregory Maguire fashioned the name from the initials of Lyman Frank Baum)
They travel to the Emerald City where they meet the The Wizard.
Dorothy tells Elphaba that she was sent by the Wizard to kill her,
but Dorothy only wants to apologize for killing her sister.
and now Elphaba wants them for herself.