Ivy faces major vocal issues, while Julia struggles to avoid Michael. Meanwhile, Karen books a side gig at a bar mitzvah.

Eileen, Derek and the team present ''Marilyn the Musical'' to would-be investors. Ivy struggles to perform. Karen must make a difficult choice. Julia and Michael face the consequences of their actions.

The team deals with the workshop's after-effects; Derek asks Karen to help him steal the show from Tom and Julia; Eileen's daughter's surprise visit forces her to deal with her ex-husband.

When the show's new star gets stuck in Cuba, Derek puts Karen in as understudy; Tom and Julia celebrate their anniversary.

The arrival of a movie star turns ``Bombshell'' upside-down; Ivy and Karen try to overcome their history and unite against their new rival; Tom and Sam's romance heats up.

Karen finds herself seduced by the glamorous life of new BFF Rebecca Duvall -- but can Rebecca be trusted? What will Karen's ascent mean to her relationship with Dev? And will Rebecca drive Derek insane? Eileen introduces new beau Nick to ex-husband Jerry, while Julia panics when her son Leo goes missing.

Ivy worries as Derek grows closer to Rebecca and Karen has to choose between Dev and the show. Ellen and Julia fight over Michael's possible return and Sam brings Tom to a family dinner.

"Bombshell" faces its first audience just as a major crisis hits Rebecca Duvall. The team of Tom and Julia scramble to fix the show when the first preview falls short, and Frank must adjust to the unwelcome return of Michael Swift to his life. Dev seeks reconciliation with Karen, but explosive information about Ivy lurks just beneath the surface.

Tom and Julia work to save the show, while Derek makes a decision that will forever change Karen's and Ivy's lives; Ellis tries to save the show.

Back from a successful run in Boston, Eileen, Julia and Tom are blindsided by both personal and professional obstacles as they seek to take "Bombshell" to Broadway. Karen consults her new mentor, Broadway star Veronica "Ronnie" Moore, as she finds herself on the brink of fame, but her success may come at cost to Ivy. A new talent is discovered in an unexpected place. Meanwhile, Derek copes with a damaging accusation.

Derek calls in help for a special event, but Jimmy's pride might get in the way of a huge opportunity Karen orchestrates for him and Kyle. Peter challenges Julia's pride as they continue to work together. Meanwhile, Ronnie struggles to assert her independence from a powerful mother, as Eileen finds herself at a moral crossroads with huge ramifications for "Bombshell."

Julia's fears increase when Tom airs his suspicions of Peter. Jimmy and Kyle confront their own crisis of confidence as "Hit List" is read for the first time. Meanwhile, Ivy realizes her triumph might not be all she hoped when she meets her new co-star, Terry Falls, and Karen wonders if she can trust Jimmy.

On Tony night, the awards might not provide the answers everyone is looking for. As Jimmy faces a final reckoning, Tom, Julia, Derek, Karen, Ivy, and most of all, Eileen wait to see if the ceremony will confirm their place in the Broadway pantheon once and for all.