Mulgrew will play Hesther Saloman, the role created on Broadway by veteran actress Marian Seldes in 1974.
As previously reported, the eagerly awaited revival of Peter Shaffer's Equus, a hit at London's Gielgud Theatre, will begin previews Sept. 5 at the Broadhurst Theatre.
Radcliffe and Tony and Olivier Award winner Griffiths — who played to sold-out crowds in the London revival — will reprise their roles as, respectively, Alan Strang and Dr. Martin Dysart. Opening night at the Broadhurst is scheduled for Sept. 25, and the production will play a 22-week engagement through Feb. 8, 2009.
Thea Sharrock, who directed the London run, will direct on Broadway as well. The creative team also features set and costume designer John Napier, lighting designer David Hersey and sound designer Gregory Clarke.
In Equus, press notes state, "psychiatrist Martin Dysart investigates the blinding of six horses, a savage act committed by an unassuming 17-year-old stable boy, Alan Strang, whose family life is rife with bigotry and religious fervor. As Dysart exposes the truths behind the boy's demons, he finds himself face-to-face with his own." Playwright Shaffer based the play on a true story told to him by a friend.
Equus reunited Radcliffe and Griffiths, who appeared together in the "Harry Potter" movies. London Equus producers David Pugh and Dafydd Rogers gave Radcliffe his first role in the West End as a celebrity guest in The Play What I Wrote.
Kate Mulgrew has been seen on the New York stage in The American Dream/The Sandbox, Iphigenia 2.0, Our Leading Lady, Tea at Five (Outer Critics Circle, Lucille Lortel nominations), Black Comedy and Titus Andronicus and on the London stage in The Exonerated. Her numerous screen credits include "Star Trek: Nemesis," "Remo Williams: The Adventure Begins," "Throw Mama From The Train," "A Stranger Is Watching," "Ryan's Hope," "Mrs. Columbo" (Golden Globe nomination), "Kate Loves A Mystery," "Cheers" and "Black Donnellys." Mulgrew also portrayed Captain Kathryn Janeway in TV's "Star Trek: Voyager" for which she won Golden Satellite and Saturn Awards.
Equus bowed on Broadway in October 1974 at the Plymouth Theatre. The production — directed by John Dexter — won the 1975 Tony for Best Play and ran 1,209 performances. The upcoming production will mark the show's first Broadway revival. Playwright Shaffer is also the author of Amadeus, Lettice and Lovage, The Royal Hunt of the Sun and White Liars & Black Comedy.
Tickets for Equus — which is being produced on Broadway by The Shubert Organization — are available by calling (212) 239-6200 or by visiting www.telecharge.com.
The Broadhurst Theatre is located in Manhattan at 235 West 44th Street.