Groundskeeper Willie, the aggressively Scottish handyman who works for Springfield Elementary School on "The Simpsons," first appeared in the episode "Principal Charming", the one where Principal Skinner (Harry Shearer) attempted to seduce and marry Aunt Patty (Julie Kavner). Skinner and Patty bond over their mutual grumpiness, as he is a stern taskmaster with his students and she is a general misanthrope. Groundskeeper Willie doesn't play a major part in the story, except when Bart (Nancy Cartwright) breaks into his supply shed to steal grass killer. Skinner will pull a similar prank later in the episode. Willie has two lines in the episode: "You'll be back" and "I told you you'd be back." 

Groundskeeper Willie (Dan Castellaneta) went on to appear in at least 53 additional episodes of the series, a number that will only continue to grow. He has been greased up by Lunchlady Doris (Doris Grau), fallen in love with his tractor,...