Mazzie played Guenevere in the New York Philharmonic's recent production of Camelot opposite Gabriel Byrne. Her many Broadway credits include Tony-nominated performances in Kiss Me, Kate, Ragtime and Passion, plus Man of La Mancha, Into the Woods and Big River. Mazzie has appeared off-Broadway in The Vagina Monologues, The Trojan Women and And the World Goes 'Round.
Dunn joins the Broadway company of Spamalot after playing the role of Sir Bedevere in the show's national tour. He previously appeared at the Shubert Theatre in Gypsy, starring Bernadette Peters. His other Broadway credits include One Mo' Time and Master Class.
Starting June 24, Emmy Award nominee Stephen Collins Seventh Heaven will replace Jonathan Hadary as King Arthur, and Grammy-nominee Drew Lachey Dancing With The Stars will replace David Hibbard as Patsy.