Fish In The Dark, Larry David’s runaway Broadway hit, has extended its limited run and will make a go of it with two new stars: The previously announced Jason Alexander, replacing David as Norman Drexel, and now Glenne Headly, replacing Rita Wilson as Norman’s wife Brenda. Headly and Alexander take over the roles beginning June 9 at the Shubert-owned Cort Theatre, with David and Wilson bowing out after the June 7 matinee.