Cast[]
- Mario as Timmy Turner
- Mama Mario as Mrs. Turner
- Papa (Mario and Luigi's Real Dad) as Mr. Turner
- Mallow as Cosmo
- Geno as Wanda
- Kooper as Poof
- Lemmy as Juandissimo
- Happy Mario as Happy Timmy Turner
- Depressed Mario as Gloomy Timmy Turner
- Angry Mario as Angry Timmy Turner
- Goofy Mario as Funny Timmy Turner
- Love Mario as Romantic Timmy Turner
- Rap Mario as Cool Timmy Turner
- The Mushroom King as Jorgen Von Strangle
- Harry (Mario Golf) as Chester McBadbat
- Donkey Kong as Elmer
- Alex as A.J.
- Funky Kong as Sanjay
- Wario as Francis
- Yoshi as Tootie
- Luigi as Trixie Tang
- Goombario as Mark Chang
- Bowser as Shallow Grave (Shallowgrave)
- Eely-Mouth as Denzel Crocker
- King Boo as Dark Laser
- Boolossus as Foop
- Peach as Vicky The Babysitter
- Princess Shroob as Dolores-Day Crocker
- Raphael The Raven as Anti-Cosmo
- Huff N. Puff as Anti-Wanda
- The Spooky Speedster as Crimson Chin
- Baron Brrr as Nega-Chin
- Red Koopa Kid as The Head Pixie
- Blue Koopa Kid as Sanderson
- Green Koopa Kid as Flappy Bob
- Oogtar as Binky
- Boshi as Bucky
- Chunky Kong as Norm
- Mouser as Remy
- Lubba as Chet Ubetcha
- Baby Luigi as Tommy Turner
- Baby Mario as Tammy Turner
- Dr. Mario as Future Timmy Turner
- Sonic The Hedgehog as Jimmy Neutron
- Shadow The Hedgehog as Cindy Vortex
- Knuckles The Echidna as Betty Quinlan
- Miles "Tails" Prower as Libby Folfax
- Amy Rose as Carl Wheezer
- Sally Acorn as Sheen Estevez
- Big The Cat as Goddard
- Smalls The Cat as Humphrey
- Rouge The Bat as Elke Elkberg
- Bark The Polar Bear as Nick Dean
- Bernadette Hedgehog as Judy Neutron
- Jules Hedgehog as Hugh Neutron
- Dr. Robotnik/Dr. Eggman as Professor Finbarr Calamitous
- Sonic The Werehog as Future Jimmy Neutron
- Happy Sonic as Happy Jimmy
- Depressed Sonic as Gloomy Jimmy
- Angry Sonic as Angry Jimmy
- Goofy Sonic as Funny Jimmy
- Love Sonic as Romantic Jimmy
- Rap Sonic as Cool Jimmy
- Scourge The Hedgehog as Evil Jimmy
- Chaos as Shirley