The library cop, out to collect 20 years' worth of overdue fees on Tropic of Cancer. The girlfriend with the "Jimmy Legs." "No soup for you!" "They're real, and they're spectacular!" Seinfeld was lucky enough to have an all-star fantastic foursome at its center, but you can't underestimate what the variety of supporting characters who orbited around Jerry and co.'s world brought to the mix. Some of the sitcom's best-known lines and funniest moments came from recurring sidekicks, sweethearts and arch-villains, or from one-off performances that helped turn funny episodes into flat-out classics.
So we reached out to a handful of actors who played those memorable roles and asked them to talk about shooting the episodes, working with Seinfeld's stars, what these parts did for their careers...the whole yada yada. Here are nine performers who popped in for an episode (or six) and left an indelible mark on viewers' memories — as well as a tenth participant who lent both his voice and his unique sensibility to the show.