The Grim Adventures of Billy and Mandy – S03 E17 : Substitute Teacher

The Grim Adventures of Billy and Mandy
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Billy's first cousin from the center of the Earth, Nergal Jr. goes to school for the first time, but he is worried that people may not like him. Soon enough, Junior becomes bullied by Sperg, with Miss Butterbean's allowance. Billy suggests Junior to use his shapeshifting abilities to take on the form of Miss Butterbean, so Junior can help him pass a math test. Junior likes the idea, but he morphs into Miss Butterbean to get revenge on Sperg instead. Sperg is seen living in the center of the Earth as Junior's pet.

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Cast

Mark Hamill
Malcolm McDowell
as Baron Von Ghoulish
Wayne Knight
as Jack O'Lantern
Frank Welker
as Boskov
Tom Kenny
Grey DeLisle
as Mandy (voice)
Dee Bradley Baker
as Mandy's Dad
Cree Summer
as Cave Witch (voice)
Jeff Bennett
Carol Kane
as Mrs. Claus
Michael Dorn
as King Beardbottom / Clown / Dwarf #2
David Warner
Diedrich Bader
as Hoss Delgado (voice)
Phil LaMarr
as Hector Con Carne
Clyde Kusatsu
Rob Paulsen
as Tooth Fairy
Fred Willard
as Boogey
Keone Young
as Kwan Ti
Gilbert Gottfried
as Santa Claus
John Vernon
as Dean Toadblatt
Billy West
Jennifer Hale
as Gladys (voice)
James Arnold Taylor
as Fred Flintstone
Betty White
as Mrs. Doolin (voice)
Jake Thomas
as Nigel Planter
Robin Atkin Downes
Laraine Newman
as Crossing Guard (voice)
R. Lee Ermey
as Sergeant / Drill Sergeant
Candi Milo
as Grim's Mom (voice)
Earl Boen
Scott Menville
as Pinocchio
Jess Harnell
Alan Oppenheimer
as Father Time
Henry Gibson
as Lord Pain
Debi Derryberry
as Nergal Jr.
Maxwell Atoms
as Jeff the Spider (voice)
Mary Jo Catlett
as Witch
'Weird Al' Yankovic
as Squid Hat
John Kassir
as Lord Moldybutt
Nika Futterman
as Pandora
Armin Shimerman
as General Skarr
Brian Tochi
Dawnn Lewis
as Grim's Granny
Tom Kane
as Captain Heifer
Richard Steven Horvitz
as Billy (voice)
Jane Carr
as Pud'n
Peter Renaday
Ronnie Schell
as Dean Toadblatt

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