37. Mr. Wilhelm
Best-known episode: "The Bottle Deposit"
Supervising George Costanza can't be good for anybody's mental health, and it definitely takes a toll on Mr. Wilhelm. This Yankees executive is played by Richard Herd, although he's a dead ringer for Karl Malden — he always looks like he has steam coming out of his ears. Mr. Wilhelm sometimes forgets to take his medication, which is why he fails to notice how incompetent George is, and discusses work projects by dropping cryptic clues about the Petula Clark song "Downtown." He also gets abducted and brainwashed by a carpet-cleaner cult. ("Most of the world is carpeted. And one day, we will do the cleaning.") But then Mr. Wilhelm meets the saddest fate of all: He takes a job with the Mets. ROB SHEFFIELD