Cast[]
- Carly Shay/Patty Schwab as Timmy Turner/Cleft The Boy Chin Wonder
- Freddie Benson/Chess Masterson as A.J./Professor A.J.
- Sam Puckett/Regina Goodbody as Chester McBadbat/Matter Muncher Lad
- Gibby Gibson/Roger Mole as Trixie Tang/Wonder Gal
- Megan Parker as Future Timmy Turner
- Susan as Future Vicky
- Patrice as Tammy Turner
- Tara as Tommy Turner
- Valerie as Vicky
- Shawn as Wanda
- Shannon Mitchell as Cosmo
- Jeremy as Elmer
- Gabriella as Sanjay
- Jocelyn as Francis
- Guppy Gibson as Veronica
- Leslie as Tad
- Kathy as Chad
- Ms. Francine Briggs as Denzel Crocker
- Kyoko as Dr. Bender
- Douglas as Doug Dimmadome
- Lauren Ackerman as Shallowgrave
- Yuki as Wendell Bender
- Lexi as Tooth Fairy
- Lewbert Sline as The April Fool
- Margaret Collins as Jorgen Von Strangle
- Colonel Steven Shay as Mr. Turner
- Linda Peeloff as Mrs. Turner
- Harper Bettencourt as Chloe Carmichael
- Millicent Mitchell as Sparky
- Prunella Pitz as Anti-Sparky
- Gwen as Missy
- Olive Lestari as Hummanuh
- Pearl Wallace as Viv Turner
- Paul Denham as Roy Raskin
- Potter as Hazel Wells
- Danica as Dustan Lumberlake
- Tori Vega/Louise Nordoff as Jimmy Neutron/Hulk Jimmy
- Cat Valentine as Sheen Estevez
- Hope Quincy as Nick Dean
- Beck Oliver and André Harris as Libby Folfax
- Moose as Sagebrush Sally
- Jade West and Trina Vega as Carl Wheezer
- Robbie Shapiro as Cindy Vortex
- Allie as Ignishska Stroganovsky
- Brenda as Bolbi Stroganovsky
- Tara Ganz as Butch Pakovski
- Ryder Daniels as Eustace Strych
- Mrs. Yonders as Grandma Taters
- Hayley Ferguson as Betty Quinlan
- Larry as Goddard
- Fawn Liebowitz as Evil Jimmy
- Sinjin Van Cleef as Jet Fusion
- Courtney Van Cleef as Tina Sue
- Mr. Dickers as King Goobot V
- Mrs. Lee as Professor Calamitous
- Daisy Lee as Beautiful Gorgeous
- The Yerbanian Chancellor as Baby Eddie
- Holly Vega as Judy Neutron
- David Vega as Hugh Neutron
- Lola Martinez as Future Jimmy Neutron
- Zoey Brooks as Future Sheen Estevez
- Quinn Maria Pensky Reese as Future Carl Wheezer
- Logan Reese as Future Cindy Vortex
- Chase Matthews as Dictator Libby Folfax
- Steven Carson as Shirley
- Timmy Turner/Cleft The Boy Chin Wonder as Carly Shay/Patty Schwab
- Future Timmy Turner as Megan Parker
- Future Vicky as Susan
- Tooth Fairy as Kathy
- Winston Dunsworth as Kathy
- Chester McBadbat/Matter Muncher Lad as Sam Puckett/Regina Goodbody
- A.J./Professor A.J. as Freddie Benson/Chess Masterson
- Sanjay/The Sonic Youth as Gibby Gibson/Roger Mole
- Tommy Turner as Spencer Shay
- Cosmo as Gordon Birch
- Wanda as Jodi Flooger
- Hazel Wells as Potter
- Dustan Lumberlake as Danica
- Poof as Reuben
- Chad as Melanie Puckett
- Bucky McBadbat as Pam Puckett
- Mark Chang as Pete
- Ivette Ubetcha as Shane
- Elmer as Shawn
- Veronica as Shannon Mitchell
- Happy Peppy Gary as Chuck Chambers
- Happy Peppy Betty as Chip Chambers
- Carly as Gia Chambers
- Francis as Shelby Marx
- Mrs. Turner as Colonel Steven Shay
- Tammy Turner as Patrice
- Tommy Turner as Tara
- Head Pixie as Nevel Papperman
- Tootie as Valerie
- The Ranch Girl as Stephanie
- Trixie Tang as Veronica
- Vicky as The Video Village Clerk
- Gary as Lewbert Sline
- Remy Buxaplenty as Griffin
- A.J.'s Mom as Marissa Benson
- Sanjay's Mom as Charlotte Gibson
- Shallowgrave as Margaret Collins
- Jorgen Von Strangle as Lauren Ackerman
- Denzel Crocker as Ms. Francine Briggs
- Dr. Bender as Mr. Howard
- Norm The Genie as Kyoko
- Super Bike as Yuki
- Dark Laser as Nora Dershlit
- Chloe Carmichael as Harper Bettencourt
- Sparky as Millicent Mitchell
- Anti-Sparky as Prunella Pitz
- Missy as Gwen
- Hummanuh as Olive Lestari
- Viv Turner as Pearl Wallace
- Roy Raskin as Paul Denham
- Jimmy Neutron/Hulk Jimmy as Tori Vega/Louise Nordoff
- Carl Wheezer as Jade West
- Sheen Estevez as Cat Valentine
- Cindy Vortex as Trina Vega
- Libby Folfax as André Harris
- Betty Quinlan as Robbie Shapiro
- Future Jimmy Neutron as Lola Martinez
- Future Sheen Estevez as Zoey Brooks
- Future Carl Wheezer as Quinn Maria Pensky Reese
- Future Cindy Vortex as Logan Reese
- Dictator Libby Folfax as Chase Matthews
- Brittany Tenelli as Sinjin Van Cleef
- Goddard as Rex
- Emily Svalsbord as Beck Oliver
- Ms. Fowl as Erwin Sikowitz
- Judy Neutron as Holly Vega
- Hugh Neutron as David Vega
- Professor Calamitous as Mrs. Lee
- Evil Jimmy as Fawn Liebowitz
- Evil Carl as Francis Thornesmith
- Evil Sheen as Rhoda Hellberg
- Evil Cindy as Clarissa
- Evil Libby as Daisy Lee
- Evil Ms. Fowl as Mason Thornesmith
- King Goobot V as Mr. Dickers
- Baby Eddie as Ryder Daniels
- Poultra as Yerbanian Chancellor
- Eustace Strych as Hayley Ferguson
- Blix as Joey Ferguson
- Chip Skylark as Kenan Thompson
- Shirley as Steven Carson