Seinfeld played a fictionalized comedian from the 1989 pilot through the 1998 finale and co-created the series with Larry David.

, and co-wrote, directed, produced, and starred in the 2024 comedy Unfrosted.

Louis-Dreyfus joined in the second produced episode and remained through the finale as Elaine. She later led The New Adventures of Old Christine and Veep, accumulating a record-setting collection of acting Emmys.

Film and franchise work includes Enough Said, You Hurt My Feelings, Onward, and Marvel's Valentina Allegra de Fontaine.

Alexander played George from the pilot through season 9, bringing Broadway timing to the character. He had already won a Tony for Jerome Robbins' Broadway.

Later work spans stage directing, voice acting, Curb Your Enthusiasm, The Marvelous Mrs. Maisel, Young Sheldon, and numerous guest roles and live comedy appearances.

Richards appeared as Kramer in the pilot and remained one of the four leads through the finale, winning three Emmys.

Later he starred in The Michael Richards Show, reunited with the ensemble on Curb Your Enthusiasm, returned for its 2024 finale, and published the memoir Entrances and Exits in 2024.

Knight first appeared as Newman in season 3 and returned through the finale as Jerry's recurring neighbor and rival. Jurassic Park and Basic Instinct helped make him a familiar film character actor.

Later work includes 3rd Rock from the Sun, The Exes, Blindspotting, Harley Quinn, and extensive animation voice roles.

Harris debuted in season 4 as George's mother Estelle and continued through the final season. Her unmistakable voice also reached family audiences as Mrs.

Potato Head in the Toy Story films. Later credits included The Suite Life of Zack & Cody and animated guest work. Harris died in 2022, leaving a celebrated comic legacy.

Stiller assumed the role of Frank in season 5 and remained through season 9, after decades in the comedy team Stiller and Meara.

He later played Arthur Spooner throughout The King of Queens and appeared in Zoolander. Stiller died in 2020 and is remembered for stage, television, film, and comedy-partner work.

Sheridan played Jerry's mother Helen from season 1 through the finale. Before television she worked as a dancer and stage performer; audiences also knew her as Raquel Ochmonek on ALF.

She published the memoir Dizzy & Jimmy and continued guest acting. Sheridan died in 2022, with her public work respectfully foregrounded here.

Martin became the regular Morty Seinfeld beginning in season 2 and continued through season 9. His career stretched from New York policing into comedy writing, Broadway, and screen acting, including The Producers and Chicago.

Martin died in 2005; this entry emphasizes his unusual professional path and durable television role.

Swedberg first appeared in season 4 as NBC executive Susan Ross and became central to George's season 7 engagement story. She did not appear in the finale.

Her later public screen credits were selective, while she became widely active as a ukulele performer, teacher, and festival participant.

O'Hurley joined in season 6 as catalog executive J. Peterman and appeared through the finale.

Later he hosted Family Feud, competed on Dancing with the Stars, played Billy Flynn in Chicago, and voiced characters across animation and games. He also became a longtime host of the National Dog Show broadcast.

Warburton debuted in season 6 as Elaine's on-and-off boyfriend David Puddy and returned in season 9. He later led The Tick and Rules of Engagement and developed a major voice career through The Emperor's New Groove, Family Guy, Venture Bros., and A Series of Unfortunate Events.

Patrick Warburton — David Puddy is one of the hj featured in this gallery.

Hytner first appeared in season 6 as fellow comedian Kenny Bania and recurred through season 9. His broader résumé includes Working, Roswell, Curb Your Enthusiasm, Modern Family, and numerous guest-comedy roles.

He has also continued stand-up and live appearances, keeping the fictional comic connected to real performance work.

Lesser appeared as Jerry's Uncle Leo from season 2 through season 9, after decades of film and television work beginning in the 1950s.

Later audiences also knew him as Garvin on Everybody Loves Raymond. Lesser died in 2011, leaving a long character-acting career extending far beyond one recurring uncle.

Morris joined in season 7 as attorney Jackie Chiles and returned through the finale. His career includes Mission: Impossible family history, Star Trek appearances, Smallville's Martian Manhunter, Doom Patrol, and extensive voice work in animation and games.

Later roles continued his movement between comedy, science fiction, and superheroes.