In "The Callback," Ivy (Megan Hilty) and Karen (Katharine McPhee) jump through hoops for the brilliant but temperamental director Derek Wills (Jack Davenport) as they pursue the role of a lifetime.
Meanwhile, Julia (Debra Messing) and her husband Frank (Brian d'Arcy James), are frustrated by the red tape of an international adoption process, and Eileen (Anjelica Huston) fights to finance her new musical in the midst of an acrimonious divorce.
Watch a preview below.
Christian Borle, Raza Jaffrey, and Jaime Cepero also star.
In the episode, four songs will be performed: Blondie's "Call Me," Carrie Underwood's "Crazy Dreams," "20th Century Fox Mambo" (original), and a reprise of last week's original, "Let Me Be Your Star."
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