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Bart celebrates the most shocking birthday party of his entire life — one that might just change everyone in Springfield forever.
Rob Oliver (Director) · Jessica Conrad (Writer)
Where to watch
JustWatch
Cast
Dan Castellaneta
Homer Simpson / Abe Simpson / Barney Gumble / Krusty the Clown / Groundskeeper Willie / Mayor Quimby (voice)
Julie Kavner
Marge Simpson / Patty Bouvier / Selma Bouvier / Jacqueline Bouvier (voice)
Nancy Cartwright
Bart Simpson / Maggie Simpson / Nelson Muntz / Ralph Wiggum (voice)
Yeardley Smith
Lisa Simpson / Maggie Simpson (voice)
Hank Azaria
Moe Szyslak / Chief Wiggum / Apu / Comic Book Guy / Carl Carlson / Superintendent Chalmers (voice)
Harry Shearer
Ned Flanders / Mr. Burns / Smithers / Principal Skinner / Lenny Leonard (voice)
Guest stars
Conan O'Brien
Conan O'Brien (voice)
Danny DeVito
Herbert Powell (voice)
Seth Rogen
Seth Rogen (voice)
Maggie Roswell
Luann Van Houten (voice)
Kevin Michael Richardson
Dr. Hibbert (voice)
Alex Désert
Carl Carlson / Lou (voice)
Tress MacNeille
Agnes Skinner (voice)
Jenny Yokobori
Kumiko Albertson (voice)
Pamela Hayden
Milhouse Van Houten (voice)
Chris Edgerly
(voice)
Tom Hanks
Tom Hanks (voice)
John Cena
John Cena (voice)