Jerry Seinfeld Jerry Seinfeld Actor Julia Louis-Dreyfus Elaine Benes Actor Jason Alexander George Costanza Actor Michael Richards Cosmo Kramer Actor Heidi Swedberg Susan Ross Guest Star Jennifer Guthrie Lena Guest Star Scott Patterson Billy Guest Star John Paragon Cedric Guest Star Yul Vazquez Bob Guest Star David Byrd Roger Guest Star Ileen Getz Organizer Guest Star Steven Hack Walker 1 Guest Star Wren T. Brown Walker 2 Guest Star P.B. Hutton Walker 3 Guest Star Susan Moore Monica Guest Star Larry David Executive Producer George Shapiro Executive Producer Howard West Executive Producer