Take a look at the stars of the seminal series "Seinfeld," then and now. Joey Delvalle/NBC/NBCU Photo Bank via Getty Images

When his series premiered in 1989, Seinfeld was best known as a stand-up comic who made the rounds of the late-night shows. NBC/NBCU Photo Bank via Getty Images

Alexander couldn't have been more lovably annoying as George Costanza. NBCU Photo Bank/getty images

While Alexander hasn't snagged a permanent weekly gig, he is apt to show up in any number of shows, like as "Mountain Man" in an episode of "Community." Justin Lubin/NBC/NBCU Photo Bank/getty images

Julia Louis-Dreyfus, who played Elaine Benes, was the queen of the cast. Monty Brinton/NBC/NBCU Photo Bank via Getty Images

These days, Louis-Dreyfus is enjoying continued success with a starring role on the HBO series "Veep," which won her a Screen Actors Guild Award. LACEY TERRELL/HBO

Michael Richards won fans over as Cosmo Kramer, seen here with Liz Sheridan as Helen Seinfeld. Darius Anthony/NBC/NBCU Photo Bank via Getty Images

Richards ran into some tough times in 2006 after a rant at one of his comedy shows included some racial epithets . But he has bounced back. In 2013, he could be seen on the TV Land series "Kirstie," starring Kirstie Alley. Evans Vestal Ward/TVLand

Wayne Knight portrayed Jerry's nemesis, Newman, and "Hello Newman" became a catchphrase of the show. NBC/NBCU Photo Bank via Getty Images

Since 2011, Knight, shown here with David Alan Basche, has had a role as Haskell Lutz on the TV Land series "The Exes." Evans Vestal Ward/TVLand

Jerry Stiller played George's long-suffering father, Frank Costanza -- a role that took his fame as a comic actor to new heights. Michael Yarish/NBCU Photo Bank/getty images

Stiller found more sitcom gold as Arthur Spooner on the CBS series "The King of Queens." That series ended in 2007. Brad Barket/Getty Images

Estelle Harris starred as George's mother, Estelle Costanza. Margaret Norton/NBC/NBCU Photo Bank via Getty Images

Harris has stayed busy acting and doing voice work, including roles on the animated series "Futurama" and the voice of Mrs. Potato Head in the "Toy Story" franchise. Tibrina Hobson/FilmMagic/getty images

John O'Hurley was often the butt of the joke as J. Peterman when he teamed up with Louis-Dreyfus. Joey Delvalle/NBC/NBCU Photo Bank via Getty Images