Federer will again play the wheelchair-bound sister of Elphaba beginning Aug. 18. She succeeds Cristy Candler in the role.

A few days prior, on Aug. 11, the hit musical will welcome its newest Glinda, Erin Mackey. Mackey will succeed Alli Mauzey in the role originally created by Tony winner Kristin Chenoweth.

The cast also includes Dee Roscioli as Elphaba, Tony Award winner Rondi Reed as Madame Morrible, P.J. Benjamin as The Wizard, Kevin Kern as Fiyero, Alex Brightman as Boq and Timothy Britten Parker as Dr. Dillamond.

Michelle Federer made her Broadway debut in Wicked and was an understudy in the revival of Three Days of Rain. She appeared in the Lincoln Center Theater production of A Man of No Importance and was also seen Off-Broadway in Boys Life, Anon and In the Absence of Spring. Her regional credits include Compleat Female Stage Beauty, Water Children, The Trip to Bountiful, Hay Fever and Closer.

In addition to appearing in the Chicago, Los Angeles and touring productions of Wicked, Erin Mackey's screen credits include "The Parent Trap," "Do Over" and "Family Affair." Based on Gregory Maguire's novel, which turned every Oz myth inside out, Wicked explores the early life of the witches of Oz: Glinda and Elphaba. The two main characters meet at Shiz, a school where both hope to take up sorcery. Glinda is madly popular and Elphaba is, well, green. By a misunderstanding, they wind up roommates and, after an initial period of mutual loathing, begin to learn something about each other. Their life paths continue to intersect through a shared love, entry into the Emerald City and interaction with the Wizard himself. Eventually, their choices and convictions take them on widely different paths.

Wicked features a score by Stephen Schwartz, a book by Winnie Holzman, direction by Joe Mantello and musical staging by Wayne Cilento. The creative team also includes scenic design by Eugene Lee, costume design by Susan Hilferty, lighting design by Kenneth Posner, sound design by Tony Meola, projections by Elaine J. McCarthy, wig and hair design by Tom Watson, music supervision and arrangements by Stephen Oremus, orchestrations by William David Brohn and dance arrangements by James Lynn Abbott.

For more information visit wickedthemusical.com.