Dan Castellaneta

Mr. Ramish

Zoo Keeper

Milt

Homer Simpson / Abe Simpson / Barney Gumble / Krusty (voice)

Patrick Senior

Joe Spencer

Officer Novarro

Jenna / Judge Markway

Homer Simpson (voice) / Homer Simpson / Abe Simpson / Barney Gumble / Krusty (voice)

Frank Whitaker

Dr. Kinny

Dr. Stein

Robot Devil (voice)

Derry Murbles

Agent Armstrong

Kaznian Astronaut / Socialite / Photographer (voice) / Minister / Guard (voice)

Guard (voice) / Kobra Commando (voice)

Judge Needum Taylor

Goon (voice) / Mr. Geminini (voice) / Private Cleoutus Dobbs / Baxter (voice)

Ray Winters

Scarface (voice) / Wesker / Scarface (voice)

Steve Michaels

(voice)

Homer Simpson (voice)

Dr. Milton Hastings

Professor (uncredited)

Mr. Jumba (voice)

Brad

Mr. Horner / Franklin the Frog (voice)

Peter Oliver

Bryan

Animal Control Officer (voice) / Announcer (voice; uncredited) / Big Arnold (voice) / Bus Driver (voice) / Bus Driver / Grandpa's Grandfather (voice) / Buyer (voice) / Conductor (voice) / Delivery Man (voice) / Doctor Steiglitz / Grubby (voice) / Dr. Steiglitz (voice) / Earl (voice) / Engineer (voice) / Grandpa Phil (voice) / Grandpa Phil / Chicken Man (voice) / Grandpa Phil / Cop #1 (voice) / Grandpa Phil / Grandpa Phil's Father / Jolly Olly Man (voice) / Grandpa Phil / Judge (voice) / Grandpa Phil / Nick Vermicelli (voice) / Grandpa Phil / Nolo (voice) / Grandpa Phil / Reporter (voice) / Grandpa Phil's Father (voice) / Guard / Canned Speech (voice) / Ice Kentucky (voice) / Jolly Olly Man (voice) / Jolly Olly Man / Baseball Announcer (voice) / Jolly Olly Man / Fireman (voice) / Mover (voice) / Nick Vermicelli (voice) / Peter (voice) / Referee (voice) / Rico (voice)

Genie (voice)

Zabar (voice)

Dracula (voice)

Megavolt (voice)

Lazaar (voice)

Stewart (voice)

Dr. Harvat

Dr. Zibaldo (voice) / Prince Wudolph (voice)

Dave Bishop (voice) / Mr. Bishop (voice)

Dr. McNally

Mr. Thickly (voice)

David Champion / Homer Simpson

Emmett Brown (voice)

Walt

Dr. Harvey (voice)

Self

Additional Voice Talent (voice) / Boney / Bureauocrates (voice) / Bureauocrates (voice) / Homer (voice) / Homer / Nectar guy (voice) / Ticket salesman (voice)

Boris (voice) / Captain Howdy (voice) / Coluans (voice)

Dunkirque (voice)

Stan

Earthworm Jim / Grim Reaper / Turns-His-Eyes-Inside-Out Boy / Evil Jim / Abraham Lincoln / Japius / Stock Broker

Sven Jorgensen

Alan Frakesh

Mr. Kenny

Male Fan

Homer Simpson / Itchy / Barney / Abe Simpson / Stage Manager / K

Genie (voice)

Carlson

Additional Voices (voice)

Thing One / Thing Two (voice)

Man in Chair

The Robot Devil (voice)

Narrator (voice

Homer Simpson / Barney Gumble (voice)

Homer Simpson (voice)

Homer Simpson (voice)

Mr. Mysterio / Woodenleg Wally (voice)

Auctioneer / Horse Trader (voice) (uncredited)

Maitre D'

Homer Simpson / Willie / Grampa Simpson/ Kodos/ Various (voice)

Priest (voice)

Iron Shoes / Priest (voice)

Homer Simpson

Guard #1 (voice)

Homer Simpson / Barney Gumble (voice)

Tall Customs Dog / Angel Dog #1 (voice)

Jim Orr

Grandpa (voice)

Grandpa 'Steely' Phil / Nick Vermicelli (voice)

George Agrande

De Mille

Homer Simpson, Barney Gumble, Grampa Simpson (voice)

Gary

Homer (voice)

BoE Agent #2 (voice)

Aaron Spelling

Homer Simpson

Homer Simpson (voice)

Professor Crank (voice)

Partlow

Brian

The Postman (voice)

Stretch (voice)

Comet / Blitzen (voice)

Homer Simpson (voice)

Bumpkin

Human Cannonball

(9 episódios)

(1 episódio)