After Homer discovers that his loss of becoming president in high school was rigged, he wonders what life would have been like had he won.
This episode is the first one to be shown in high definition and the first episode since season two's "Bart Gets an F" to have a new opening sequence.
- The Cheerleader: Debbie Pinson
- For Want of a Nail: In the timeline where Homer won the election, he took Debbie Pinson to the prom, Mr. Burns would have give him a better position at the plant, he'd have a bigger house built next to the one where Mainstream Homer lives and use the mainstream one as a guest house where Abe lives and doesn't complain about anything, and he used protection to avoid having children. And he still has hair.
- In Spite of a Nail: In both timelines, Homer is married to Marge and works for Mr. Burns.