Chenoweth (Promises, Promises; Wicked) appears as auditioning actress/singer Cindy Ruehl, with Rivera (Kiss of the Spider Woman, The Rink, West Side Story, Chicago) playing experimental director/choreographer Gladys Franklin. Broadway's Max von Essen (Xanadu tour) is also seen as Cameron Dante, an actor who makes a spontaneous decision in a casting meeting, with Barrett Foa (Avenue Q) as over-the-top auditioner Gil Bure.

"Submissions Only" was created by Kate Weatherhead (who stars as struggling actress Penny) and Andrew Keenan-Bolger. Weatherhead wrote the episode, which she co-directed and co-produced with Keenan-Bolger (Mary Poppins). Also featured in the episode are series regulars Colin Hanlon and Lindsay Nicole Chambers (Legally Blonde), and semi-regulars Santino Fontana (…Earnest, Billy Elliot), Anne L. Nathan (Assassins, Thoroughly Modern Millie) and Annaleigh Ashford (Wicked).

To watch the fourth episode of "Submissions Only," look below: