Douglas Sills, Michael McGrath and Steve Rosen will join David Hyde Pierce, Tim Curry, Hank Azaria and Sara Ramirez in the upcoming Broadway musical Spamalot.

Sills, who will play Sir Galahad, previously played another Sir on the Great White Way— Sir Percy in The Scarlet Pimpernel. His performance in the musical earned him Tony, Drama Desk and Outer Critics Circle Award nominations. He recently appeared on the Great White Way in Little Shop of Horrors. His other credits include A Little Night Music, the Encores! mounting of Carnival!, Much Ado About Nothing and the Reprise! staging of Mack and Mabel.

Ken Mandelbaum previously mentioned McGrath and Rosen for the cast on July 2. McGrath is currently appearing on Broadway in Wonderful Town. His other Broadway credits include Little Me, My Favorite Year, Swingin' on a Star and The Goodbye Girl. His off-Broadway credits include The Cocoanuts, Game Show and Forbidden Broadway. McGrath will play role of Patsy and many other roles in Spamalot.

Rosen, who will play Sir Bedevere, appeared off-Broadway in the Manhattan Ensemble Theatre productions of Franz Kafka's The Castle and The Golem. His other theatrical credits include Enter Laughing, The Foreigner and Little Shop of Horrors.

Spamalot, which is being billed as “lovingly ripped-off” from the film Monty Python and the Holy Grail, will feature a book by Eric Idle based on the screenplay he co-wrote with fellow Monty Python creators Graham Chapman, John Cleese, Terry Gilliam, Terry Jones and Michael Palin and music and lyrics by Idle and John Du Prez. The stage show will also include three songs from the 1975 Monty Python and the Holy Grail film.

Directed by Mike Nichols and choreographed by Casey Nicholaw, Spamalot will premiere at Chicago's Shubert Theatre, where it is scheduled to run December 21 through January 16. It will begin previews at Broadway's Shubert Theater on February 7 in preparation for a March 10 opening.