Jerry Seinfeld Jerry Seinfeld Actor Jason Alexander George Costanza Actor Michael Richards Cosmo Kramer Actor Julia Louis-Dreyfus Elaine Benes Actor Wayne Knight Newman Guest Star Barney Martin Morty Guest Star Liz Sheridan Helen Guest Star Christa Miller Paula Guest Star Len Lesser Uncle Leo Guest Star Billye Ree Wallace Nana Guest Star Dana Wheeler-Nicholson Shelly Guest Star Guy Siner Mandel Guest Star Ellis Williams Exterminator Guest Star Coby Turner Judy Guest Star Wayne C. Dvorak Teacher Guest Star Norman Brenner Guest Star Andy Ackerman Director Alec Berg Writer Jeff Schaffer Writer