Bob Odenkirk
Episode: “The Abstinence” (Season 8, Episode 9)
Bob Odenkirk is great. A likable and charming character, he most recently starred in Better Call Saul and Breaking Bad. On Seinfeld, he plays Elaine’s boyfriend — a would-be doctor who’s not exactly a doctor yet. Of course, this sort of ambiguity is right up Seinfeld’s alley. Odenkirk had reportedly auditioned for two previous episodes as other characters.