Jerry Seinfeld Jerry Seinfeld Actor, Writer Jason Alexander George Costanza Actor Michael Richards Cosmo Kramer Actor Julia Louis-Dreyfus Elaine Benes Actor Wendie Malick Wendy Guest Star Len Lesser Uncle Leo Guest Star Billye Ree Wallace Nana Guest Star Liz Sheridan Helen Guest Star Barney Martin Morty Guest Star Carol Leifer Receptionist Guest Star Julio Oscar Mechoso Julio Guest Star Rondi Reed Mary Guest Star Gene Elman Buddy Guest Star Mary Scheer Joan Guest Star Louisa Abernathy Nurse Guest Star Timothy McNeil Jeff Guest Star Mark Fite Jack Guest Star C.D. LaBove Steve Guest Star Wendy Worthington Louise Guest Star Belinda Barry Stephanie Guest Star Andy Ackerman Director Larry David Writer