A look at next week’s “The Movie Star” aired following Monday’s episode of Smash. Watch as frenemies Karen and Ivy become allies against Uma Thurman’s Rebecca Duvall.

Watch the promo for next week’s episode below.

NBC also released a preview clip featuring Rebecca Duvall being a diva.

Episode synopsis:

Bombshell is turned upside-down by the arrival of movie star Rebecca Duvall (special guest star Uma Thurman). Karen (Katharine McPhee) and Ivy (Megan Hilty) are drawn into an uneasy alliance against their new rival — but can they overcome their history? The romance between Tom (Christian Borle) and Sam (Leslie Odom, Jr.) heats up, while Julia (Debra Messing) and Frank (Brian D’Arcy James) must put aside their differences to address a family crisis. Dev (Raza Jaffrey) faces a big decision.

What did you think of “Understudy”?