Jerry Seinfeld Jerry Seinfeld Creator, Actor Julia Louis-Dreyfus Elaine Benes Actor Jason Alexander George Costanza Actor Michael Richards Cosmo Kramer Actor Jerry Stiller Frank Costanza Guest Star Marisa Tomei Herself Guest Star Estelle Harris Estelle Constanza Guest Star John O'Hurley J. Peterman Guest Star Richard Herd Wilhelm Guest Star Phil Morris Jackie Chiles Guest Star Liz Sheridan Helen Guest Star Mary Jo Keenen Deena Lazzari Guest Star Heidi Swedberg Susan Ross Guest Star Barney Martin Morty Guest Star Wayne Knight Newman Guest Star Sandy Ward Pop Lazzari Guest Star Walter Olkewicz Nick Guest Star Annabelle Gurwitch Katy Guest Star Brenda Strong Sue Ellen Guest Star Frances Bay Mabel Guest Star Andy Ackerman Director Larry David Executive Producer, Writer George Shapiro Executive Producer Howard West Executive Producer Gregg Kavet Writer Peter Mehlman Writer Andy Robin Writer Matt Selman Writer