Jimmy Neutron

Jeffrey Garcia

Sheen Estevez (voice)

Debi Derryberry

Jimmy Neutron (voice)

Rob Paulsen

Carl Wheezer (voice)

Carolyn Lawrence

Cindy Vortex (voice) / Cindy Vortex / Phantom #2 (voice) / Cindy Vortex / Tina Sue (voice) / Cindy Vortex / Yuri (voice)

Frank Welker

Goddard / Mr. Strych / Special Vocal Effects (voice) / Goddard / Mr. Wuggles / Special Vocal Effects (voice) / Goddard / Phantom #4 / Special Vocal Effects (voice) / Goddard / Second Guard / Special Vocal Effects (voice) / Goddard / Special Vocal Effects

Mark DeCarlo

Hugh Neutron (voice) / Hugh Neutron / Announcer (voice) / Hugh Neutron / Clerk (voice) / Hugh Neutron / Commercial Narrator (voice) / Hugh Neutron / Eddie / Newt / Gomer (voice) / Hugh Neutron / Flippy (voice) / Hugh Neutron / General / Alien Man / Emerge

Crystal Scales

Libby Folfax (voice) / Libby Folfax / Chicks (voice) / Libby Folfax / Chuck (voice) / Libby Folfax / Ike (voice) / Libby Folfax / Libby's Brother (voice) / Libby Folfax / Libby's Mom (voice) / Libby Folfax / Maggie (voice) / Libby Folfax / Ozzie (voice) /

Megan Cavanagh

Judy Neutron (voice) / Judy Neutron / Crowd Member #2 (voice) / Judy Neutron / Girl (voice) / Judy Neutron / Gretchen (voice) / Judy Neutron / Hilgo (voice) / Judy Neutron / Lunch Lady (voice) / Judy Neutron / Masseuse / MaternoTron (voice) / Judy Neutron

Andrea Martin

Ms. Fowl (voice) / Ms. Fowl / Lady (voice)

Candi Milo

Britney (voice) / Female Fish (voice) / Nick Dean (voice) / Nick Dean / Amber (voice) / Nick Dean / Britney (voice) / Nick Dean / Germy (voice) / Nick Dean / Ignishka (voice) / Nick Dean / Phantom #1 (voice) / Nick Dean / Terry (voice)

Billy West

Blix (voice) / Corky Shimatzu (voice) / Corky Shimatzu / Larry Llama (voice) / Sam Melnick (voice) / Sam Melnick / Blix (voice) / Sam Melnick / Corky Shimatzu (voice) / Sam Melnick / Corky Shimatzu / Kid (voice) / Sam Melnick / Corky Shimatzu / Lars (voic

Phil LaMarr

Bolbi (voice) / Bolbi / Pitz / Teenager (voice) / Bolbi / Toy Executive (voice) / Bolbi / TV Announcer (voice)

Jim Cummings

Atila (voice) / Captain Betty / Mayor (voice) / Martian #3 (voice) / Mayor (voice) / Mayor / Dog (voice) / Popbot / Gortox / Goddard Speaking (voice) / Ultra Lord (voice)

Tom Kenny

Copbot / Interviewer (voice) / Max / Wilderman / Mr. Moodini (voice) / Nanobot #2 (voice) / WL3000 (voice)

Jeff Bennett

Dr. Moist / Announcer (voice) / Positive Jimmy / Negative Jimmy / Macho Jimmy (voice) / Travoltron / Newscaster / Salesman (voice) / Travoltron/Barbarino (voice)

Maurice LaMarche

Goddard Digital Voice (voice) / Zix / Tee / Reporter (voice) / Zix / Ticket Taker (voice)

Corey Burton

Dr. Dark / Pizza Monster (voice) / Head Monk (voice) / Rayburn (voice) / Spamdini (voice)

Kath Soucie

Betty Quinlan (voice)

Tim Curry

Professor Calamitous (voice)

Grey DeLisle

Elke (voice) / Mombot (voice) / Sally (voice)

Daran Norris

Nanobot #1 (voice) / Nanobot #1 / Baby Quackers (voice)

Joe Lala

Mr. Estevez (voice)

Jim Belushi

Coach Gruber (voice)

Kevin Michael Richardson

Tee (voice) / Tremendous Jackson (voice)

Michael Hagiwara

Japanese Announcer (voice) / Master Hong / Ninja (voice)

Phyllis Diller

Granny Neutron (voice)

Paul Greenberg

Brobot (voice) / Brobot / Man on TV (voice)

James Sie

You Yee / Elderly Monk / Ninja (voice)

Peter Frampton

Hugh Neutron (singing voice)

Ming-Na Wen

Peggy Tsu (voice)

Tom Kane

Dean Cain (voice)

Wendie Malick

Beautiful Gorgeous (voice)

Christian Slater

Jet Fusion (voice)

Jim Meskimen

Quentin Smithee (voice)

Michael Clarke Duncan

Commander Baker (voice)

Ben Stein

Giggles the Clown (voice)

Mel Brooks

Santa Claus (voice)

Neil Ross

Announcer (voice)

John Kassir

Seymour / Student #3 (voice)

Tress MacNeille

Annabelle / Aunt Kari / Great Aunt Amanda (voice)

Bill Farmer

Buford / Reporter (voice)

Charlie Adler

Junkman (voice)

Terry Wood

Singer (voice)

Edie McClurg

Grandma Taters (voice)