Jerry Seinfeld Jerry Seinfeld Actor Julia Louis-Dreyfus Elaine Benes Actor Jason Alexander George Costanza Actor Michael Richards Cosmo Kramer Actor Wayne Knight Newman Guest Star Barney Martin Morty Guest Star Liz Sheridan Helen Guest Star John O'Hurley J. Peterman Guest Star Len Lesser Uncle Leo Guest Star Jonathan Penner Zach Guest Star Ted Rooney Crichton Guest Star Jon Gries Rusty Guest Star Sonya Eddy Rebecca DeMornay Guest Star Merrin Dungey Cashier Guest Star Kevin Ruf Security Guard Guest Star Larry David Executive Producer George Shapiro Executive Producer Howard West Executive Producer Andy Ackerman Director Spike Feresten Writer Darin Henry Writer Marc Jaffe Writer