Jerry Seinfeld Jerry Seinfeld Creator, Actor Julia Louis-Dreyfus Elaine Benes Actor Jason Alexander George Costanza Actor Michael Richards Cosmo Kramer Actor Barney Martin Morty Guest Star Liz Sheridan Helen Guest Star John Michael Higgins Kurt Guest Star Miguel Sandoval Marcelino Guest Star Andrea Bendewald Celia Guest Star Kathryn Joosten Betsy Guest Star Paul Perri Detective Danner Guest Star Al White Detective Udewitz Guest Star Ray Proscia Bobby - Guard Guest Star Larry David Executive Producer George Shapiro Executive Producer Howard West Executive Producer