Sometimes they had bigger roles, like George's parents, and sometimes they are remembered for only one episode ... on ...

As amazing as it is to watch all 180 episodes of Seinfeld, however ... but you also have to love the interruptions from ...

“Seinfeld” is one of the greatest sitcoms ... Mr. and Mrs. Costanza, George Steinbrenner and many more. Then there are the characters who showed up infrequently, often only once.