The show's permanent cast includes Carolyn Baeumler, Marsha Stephanie Blake, Megan Byrne, Stephen Kunken, Aasif Mandvi, Lois Markle, Ellen McLaughlin, Charles Parnell, Keith Randolph Smith, and Danton Stone.
Redgrave, who will appear December 10-11, recently completed the Los Angeles run of her solo show Nightingale. She has earned Tony Award nominations for Shakespeare For My Father (which she also wrote), Mrs. Warren's Profession, and The Constant Wife. She received both Drama Desk and Obie awards for her work in the Off-Broadway show Talking Heads. On December 7, she earned a Grammy Award nomination for Best Children's Spoken Word Album for The Witches.
Margulies, who will appear December 17-18, starred earlier this year on Broadway in Festen. Her Off-Broadway credits include Intrigue With Faye. She is best known for her Emmy Award-winning role as Nurse Carol Hathaway on the NBC series E.R., and will be seen shortly in the SciFi Channel miniseries The Lost Room.