Alexander is scheduled to replace David in the Broadway hit on June 9, two days after David finishes his scheduled run on June 7.
The cameo was confirmed by a production spokesperson, who issued the following statement: "Last night at the Cort Theatre, Jason Alexander surprised author and star Larry David with a walk-on cameo in the second act of the play."
Here is a video of the surprise appearance, provided by the production:
David was one of the creators and head writer of "Seinfeld."
Alexander, who won the 1989 Tony as Outstanding Actor in a Musical for Jerome Robbins Broadway, made his Broadway debut in the original cast of Stephen Sondheim and George Furth's 1981 Merrily We Roll Along, and made his last Broadway appearance in 1990's Accomplice.
"I left Broadway 25 years ago because Larry David co-created the show that would change my life and career,” Alexander said in a prepared statement. “It is totally amazing that he also created the show that would bring me back to Broadway. I am thrilled I get to do this hilarious play for him and with this wonderful cast. It is quite simply more fun than any bald man should have."
David, who wrote and stars in Fish in the Dark, said, "Not only was I fortunate enough to write for Jason Alexander on 'Seinfeld,' but I also had a ringside seat watching his brilliant, indelible performances. Needless to say, I was thrilled when I heard he was replacing me in Fish in the Dark. Finally I can enjoy the show.”
Alexander returns in a show that is already something of a blockbuster. Prior to its first preview (Feb. 2), the world premiere of Fish in the Dark had taken in more than $13.5 million in advance sales at the box office. That figure is the highest advance for any spring production on Broadway and, according to the New York Times, beats the previous record for a play, $13.05 million for the 2013 revival of Harold Pinter's Betrayal (produced by Scott Rudin, the producer of Fish in the Dark).
The play, from the creator and star of HBO’s “Curb Your Enthusiasm” and co-creator of “Seinfeld," is directed by Tony Award winner Anna D. Shapiro.
Fish in the Dark is described as "a comedy about a death in the family."
The production has scenic design by Todd Rosenthal, costume design by Ann Roth, lighting design by Brian MacDevitt and sound design by Rob Milburn and Michael Bodeen.
Fish is produced by Rudin.
Show times are Monday-Saturday at 8 PM with matinees Wednesday and Saturday at 2 PM. Beginning March 10, show times will be Tuesday and Thursday at 7 PM and Wednesday, Friday and Saturday at 8 PM with matinees Wednesday and Saturday at 2 PM and Sunday at 3 PM.
Tickets, priced $65-$155, are now available at Telecharge.com.