- Maddie Taylor - Sparky (voice)
- Jason Bateman - Tommy Turner (voice)
- Jane Carr - Mama Cosma (voice)
- Jay Leno - The Crimson Chin (voice)
- Jay Leno - The Crimson Chin / The Nega-Chin (voice)
- Jay Leno - The Crimson Chin / Self (voice)
- Jay Leno - Crimson Chin Doll (voice)
- Julie Chen Moonves - Starlet (voice)
- Norm Macdonald - Norm the Genie (voice)
- Jess Harnell - Singer (voice)
- Adam West - Adam West (voice)
- Kevin Michael Richardson - A.J.'s Dad / Sanjay's Dad (voice)
- Frankie Muniz - Chester McBadbat (voice)
- Tom Kenny - Cupid (voice)
- Tom Kenny - Cupid / Portrait Painter (voice)
- Chris Kirkpatrick - Chip Skylark (voice)
- Chris Kirkpatrick - Chip Skylark / Skip Sparkypants (voice)
- Gilbert Gottfried - Dr. Bender / Wendell Bender (voice)
- Gilbert Gottfried - Dr. Bender / Wendell (voice)
- Dee Bradley Baker - Truant Officer Shallowgrave / Clown / Birthday Attendee (voice)
- Dee Bradley Baker - Fairy Judge / Elmer (voice)
- Dee Bradley Baker - Adrenaland Employee #1 / Kid #2 (voice)
- Dee Bradley Baker - Waiter (voice)
- Dee Bradley Baker - Elmer / Zit Teen (voice)
- Dee Bradley Baker - Albert Einstein / Boy #1 / Boy #3 / Doidle (voice)
- Dee Bradley Baker - Elmer / Sanjay / Ishmael / Pirate #2 / Aramic (voice)
- Dee Bradley Baker - Dad as Kid / 70's Kid / Guard (voice)
- Dee Bradley Baker - News Director / Sanjay (voice)
- Dee Bradley Baker - Chuck Cheeseley / Human Pin-Cushion / Crocodile Man (voice)
- Dee Bradley Baker - Astronaut / Sanjay / Elmer / Roman Emperor (voice)
- Dee Bradley Baker - Remy Buxaplenty / Phone Voice / Dale Dimmadome (voice)
- Dee Bradley Baker - Elmer / Sanjay / Nerd / Shark #2 / Angry Tourist (voice)
- Dee Bradley Baker - Vet / Teacher / Chet / Barry / TV Wrestler (voice)
- Dee Bradley Baker - Sanjay (voice)
- Dee Bradley Baker - Bronze Kneecap / P.A. / Dorky Kid / Clown (voice)
- Dee Bradley Baker - Dr. Poof / Reporter #2 / Kid #2 / Elmer / Binky (voice)
- Dee Bradley Baker - Teddy Bear / Yugopotamian #1 (voice)
- Rob Paulsen - Mark Chang / King Gripullon (voice)
- Rob Paulsen - Bucky McBadbat (voice)
- Rob Paulsen - King Grippulon / Mark (voice)
- Rob Paulsen - Skating Announcer / Mark Chang (voice)
- Rob Paulsen - Nerd #3 / Mark Chang (voice)
- Rob Paulsen - Mr. Burkenbake / Fairy Mason / Orderly #2 (voice)
- Rob Paulsen - Bucky McBadbat / Monster Emergency Response Man (voice)
- Rob Paulsen - Mark Chang / King Grippulon / Gary (voice)
- Rob Paulsen - Mark Chang / King Grippullon (voice)
- Butch Hartman - Comic Dealer / Actor / Cop #2 (voice)
- Butch Hartman - Erik (voice)
- Butch Hartman - Gardener / Driver / Hamster (voice)
- Butch Hartman - Father / Jail Cop / Football Coach (voice)
- Butch Hartman - Eric / Yugopotamian Male (voice)
- Butch Hartman - Minister (voice)
- Butch Hartman - Computer Voice / Alien Captain (voice)
- Butch Hartman - President / Park Patron (voice)
- Butch Hartman - Bus Driver (voice)
- Faith Abrahams - Francis (voice)
- Laraine Newman - Queen Jipjorrulac (voice)
- Laraine Newman - Queen Jipjurrulac (voice)
- Laraine Newman - Mother Nature (voice)
- Dionne Quan - Trixie Tang (voice)
- Jason Marsden - Chester McBadbat (voice)
- Mary Hart - Fairy Hart (voice)
- Jackie Mason - The Sandman (voice)
- Rick Fox - Smooth / Flash (voice)
- Ben Stein - The Pixies (voice)
- Patton Oswalt - Crimson Chin Writer
- James Arnold Taylor - Sprig Speevak (voice)
- Richard Steven Horvitz - Chuck (voice)
- Queen Latifah - Pam Dromeda (voice)
- Bob Goen - Bob Glimmer (voice)
- Tony Sirico - Big Daddy (voice)
- Carolyn Lawrence - Ms. Sunshine (voice)
- Dana Carvey - Schnozmo (voice)
- Eric Bauza - Foop (voice)
- Fred Seibert
- Guy Moon
Tara Strong hace el papel de Timmy Turner / Poof (voice).
Susanne Blakeslee interpreta a Wanda / Mrs. Turner (voice) en la serie.
Daran Norris hace el papel de Cosmo / Mr. Turner (voice).
Carlos Alazraqui hace el papel de Denzel Q. Crocker (voice).
Jim Ward interpreta a Chet Ubetcha (voice) en la serie.
Gary LeRoi Gray interpreta a A.J. (voice) en la serie.
Grey DeLisle interpreta a Vicky (voice) en la serie.
Kari Wahlgren hace el papel de Chloe Carmichael (voice).
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