Seinfeld is considered by many the best sitcom of all time and the show is full of amazing actors and actresses that went on to become some of the most famous and beloved ones in the industry. There's no denying the legacy and impact Seinfeld had on television after its debut in 1989, from inspiring other sitcoms to launching the careers of several actors. Seinfeld was created by Larry David and Jerry Seinfeld and stars Jerry Seinfeld as a fictionalized version of himself. The rest of the main cast includes Jason Alexander as Jerry's best friend, George Costanza, and Julia Louis-Dreyfus as Jerry's former girlfriend, Elaine Benes.
Source:https://www.cbr.com/actors-who-appeared-on-seinfeld/