- Brent as Bart Simpson
- Cornelius as Otto
- Cornelius (Roddy McDowall) as Krusty the Clown (uncredited, opening archive footage from Planet of the Apes)
- Zira as Marge Simpson
- Dr. Zaius as Homer Simpson
- Nova as Lisa Simpson
- Mendez as Ned Flanders
- Albina as Edna Krabappel
- Capay as Waylon Smithers Jr.
- Verger as Snake Jailbird
- Adiposo (credited as Fat Man) as Itchy
- Ongaro (credited as Negro) as Scratchy
- General Ursus as Chief Clancy Wiggum
- Taylor as Ralph Wiggum
- Skipper as Martin Prince, Jr.
- Minister as Mr. Burns
- The Narrator as Grandpa Abe Simpson
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