Robot Devil (voice) / The Robot Devil (voice)

Supporting Role

Joe Spencer

Mr. Jumba (voice)

Milt

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

Dracula (voice)

Grandpa Phil (voice) / Grandpa Phil / Nick Vermicelli (voice) / Nick Vermicelli (voice) / Grandpa Phil / Grandpa Phil's Father / Jolly Olly Man (voice) / Animal Control Officer (voice) / Grandpa Phil / Judge (voice) / Grandpa Phil / Cop #1 (voice) / Grandpa Phil / Chicken Man (voice) / Delivery Man (voice) / Grandpa Phil / Nolo (voice) / Grandpa Phil / Reporter (voice) / Big Arnold (voice)

Tiny Werner

Dr. Stein

Homer Simpson (voice)

Dr. Kinny

Zabar (voice)

Steve Michaels

Supporting Role

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

Megavolt (voice) / Loudspeaker Announcer (voice)

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

Andrew Preston

Ray Winters

Commissioner Jerry Salerno

Earl (voice) / Earl / Minister (voice) / Earl / Doctor (voice) / Earl / Horse (voice) / Earl / Ice Cream Vendor (voice) / Earl / Jimmy (voice) / Earl / Astronaut #1 / Pimply Kid (voice) / Earl / Ed / Thug (voice) / Earl / Man #3 (voice) / Earl / Hat Guy (voice) / Earl / Principal (voice) / Earl / Show Announcer (voice) / Earl / Kid #2 (voice) / Earl / Janitor #2 (voice) / Earl / Neighbour (voice) / Earl / Bully Twin #2 (voice) / Earl / Lineman / Old Man (voice) / Earl / Cootie Victim (voice) / Earl / Judge (voice)

Diane's Teacher (uncredited)

Auctioneer / Horse Trader (voice)

Man in Chair

Bryan

Male Fan

Izzy

Priest (voice)

Eddie Day

BoE Agent #2 (voice)

Guard #1 (voice)

Grandpa 'Steely' Phil / Nick Vermicelli (voice)

Hunter #1 / Hunter #2 / Lackey / Casey Kasemish DJ (voice) / Robot Sentry 1 / Robot Sentry 2 (voice) / Mr. Zoop / Alnip (voice) / Slam-bot / Fussy-Boy (voice) / Senator Banda / Garron / Nifty Joe (voice) / AP-99 (voice) / Brain Pod #13 (voice) / Resort Manager / Alien / Captain Alien (voice)

Stan

Additional Voices (voice)

Animated Babysitter (voice)

Maitre D'

Tall Customs Dog / Angel Dog #1 (voice)

Brian

Thing One / Thing Two (voice)

Carlson

Mr. Kenny