It's the second highest rated episode of all time! Frank Grimes (or Grimy as he likes to be called) gets a job at the plant and takes an instant (and understandable) dislike to Homer. Bart buys a factory for a buck and employs Milhouse as its night watchman. [Synopsis at 12:21]
142) S08E23 (Homer's Enemy) | No Money Down Podcast (Simpsons Trivia) - Listen or read transcript on Metacast