Ten years ago this week, 76 million viewers tuned in as Seinfeld said goodbye. (Well, it was ten years ago when we first posted this quiz.) Since the finale, many guest stars have gone on to enjoy rather impressive careers of their own. Inspired by Pete McEntegart's 2007 SI.com story on this topic and with a major assist from IMDb, this quiz asks you to match the actor to the Seinfeld character he or she portrayed.