A brief synopsis of the episode, courtesy of NBC, follows. Be forewarned, there are spoilers in the description. "The show has landed a star, the mercurial Rebecca Duvall (guest star Uma Thurman), but Eileen (Anjelica Huston) is thrown into a panic when Rebecca gets stuck in Cuba," according to press notes. "Derek (Jack Davenport) puts Karen (Katharine McPhee) in as understudy, but she must learn to perform under extreme pressure as he threatens to break her will. Tom and Julia (Christian Borle and Debra Messing) celebrate their anniversary with a ritual – and face some hard truths about what show business can do to relationships." Megan Hilty, Raza Jaffrey and Jaime Cepero also star. Uma Thurman guest stars.

As previously reported, the April 2 episode is titled "Hell on Earth." In "Hell on Earth," the "team begins their pursuit of a marquee star, as Eileen (Anjelica Huston) charges Tom and Julia (Christian Borle and Debra Messing) with finding a title for the newly reinvigorated musical. Karen (Katharine McPhee) and Ivy (Megan Hilty) find themselves in competition again -- this time for an orange juice commercial. Relationship troubles abound, as Frank (Brian d'Arcy James) makes an unwelcome discovery." Jack Davenport, Raza Jaffrey and Jaime Cepero also star.

For more information visit www.nbc.com/smash.