Loosely based on the original 1900 novel "The Wonderful Wizard of Oz" written by L. Frank Baum, "Wicked" tells the background story of the witches we meet in Oz during Dorothy's famous visit.

Here's a look at the key characters in Oz and the actors who play them. We've got room on the couch! Sign up for USA TODAY's Watch Party newsletter for more recaps of your favorite shows. Cynthia ...