Details Revealed for "Smash" Episodes "The Dress Rehearsal" and "Opening Night"; Bernadette Peters, Rosie O'Donnell Guest Star

Details have been announced for the April 13 and 20 episodes of the new NBC musical drama "Smash," which will air at 9 PM ET both nights.

Synopses of the episodes, courtesy of NBC, follow. Be forewarned, there are spoilers in the descriptions.

The April 13 episode, which is entitled "The Dress Rehearsal," is described as such: "As Tom ( Christian Borle) and Julia ( Debra Messing) race to ready Bombshell for previews, Tom’s eagerness to prove himself may not be the best thing for the show. An onstage mishap forces Ivy ( Megan Hilty) to make a choice, while tension mounts at Hit List as Karen ( Katharine McPhee) becomes suspicious of Derek’s (Jack Davenport) motives towards her." Anjelica Huston, Jeremy Jordan, Leslie Odom, Jr., Krysta Rodriguez and Andy Mientus also star. Jamey Sheridan and Jesse L. Martin guest star.

In the April 20 episode, which is titled "Opening Night," "it’s Bombshell’s opening night. As Ivy’s ( Megan Hilty) nerves get the better of her, support comes from an unlikely source. Meanwhile, Tom (Christian Borle) and Julia ( Debra Messing) look to their next project. Bombshell’s success may be in jeopardy as Eileen’s ( Anjelica Huston) issues with Richard (guest star Jamey Sheridan) come to a head. Jimmy ( Jeremy Jordan) finally opens up to Karen (Katharine McPhee) about his past, but is it too little too late?" Jack Davenport, Krysta Rodriguez and Andy Mientus also star. Rosie O’Donnell, Alison Fraser, Bernadette Peters, Jesse L. Martin and Jamey Sheridan guest star.

The earlier episodes of the season introduced a slew of characters as well as a new tone created by new series "showrunner" and executive producer Joshua Safran.

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