Jerry Seinfeld Jerry Seinfeld Actor Julia Louis-Dreyfus Elaine Benes Actor Jason Alexander George Costanza Actor Michael Richards Cosmo Kramer Actor Kevin Page Stu Chermack Guest Star Peter Blood Jay Crespi Guest Star Jane Leeves Marla Penny Guest Star Bob Balaban Russell Dalrymple Guest Star Peter Crombie "Crazy" Joe Davola Guest Star Heidi Swedberg Susan Biddle Ross Guest Star Barney Martin Morty Seinfeld Guest Star Liz Sheridan Helen Seinfeld Guest Star Wayne Knight Newman Guest Star Anne Twomey Rita Guest Star Jeremy Piven Michael Barth (TV George) Guest Star Larry Hankin Tom Pepper (TV Kramer) Guest Star Elena Wohl Sandi Robbins (TV Elaine) Guest Star Al Ruscio Manager Guest Star Richard Gant Fred Guest Star Larry David Executive Producer George Shapiro Executive Producer Howard West Executive Producer