The production is set to begin previews April 23 and open May 15. Also in the cast are Kate Blumberg, Annabelle Gurwitch, Clea Lewis, Richard Portnow, Grant Shaud, Skipp Sudduth and Christopher Evan Welch.

Thomas is known to television audiences as rival Jerry Gold on "Murphy Brown" (for which he garnered two Emmy Awards) and barmaid hubby Eddie Lebec on "Cheers." Thomas was also at the center of the Darva Conger fiasco as he hosted the Fox reality show "Who Wants to Marry a Multi-Millionaire?"

Writer's Block marks the theatrical directorial debut of Academy Award-winner Allen, known for his acting, plays, screenplays and film directing.

The world premiere of Writer's Block is comprised of two new one-act comedies — Riverside Drive and Old Saybrook. Riverside Drive takes place on the street of the same name in New York City and Old Saybrook takes place in a house in Connecticut. The Atlantic Theater Company website is www.atlantictheater.org.

Casting is by Bernard Telsey Casting. Juliet Taylor, Allen's longtime collaborator, is the casting consultant. Scenic design is by Santo Loquasto, lighting design by Jim Ingalls with costume design by Laura Bauer. For tickets to Writer's Block at Atlantic Theater Company, 336 W. 20th Street, between Eighth and Ninth Avenues, call (212) 239-6200. The show plays 8 PM Tuesday-Sunday, 2 PM Saturday and 3 PM Sunday.

For Atlantic Theater Company membership information, call (212) 645-1242.

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Woody Allen's plays include Don't Drink the Water, The Floating Light Bulb, Death Defying Acts and Play It Again, Sam. His films as a director or writer include "What's Up, Tiger Lily?," "Everything You Always Wanted to Know About Sex," "Bananas," "Annie Hall," "Broadway Danny Rose," "Hannah and Her Sisters," "Manhattan Murder Mystery," "Bullets Over Broadway" and his foray into the moviemusical "Everyone Says I Love You."