List of cast and crew members

Executive producers

 * Butch Hartman
 * Fred Seibert
 * Scott Fellows (season 6–present)

Main cast

 * Mary Kay Bergman as Timmy Turner #1 Creampuff #1/Mrs. Bigfoot. (Original Voice of Timmy Turner from the Oh Yeah! Cartoons)
 * Tara Strong as Timmy Turner #2, Poof, Tad, Blonda, Princess Mandie and Britney-Britney
 * Daran Norris as Cosmo, Mr. Turner, Jorgen Von Strangle, Anti-Cosmo, The April Fool, George Washington and Grandpa Pappy
 * Susan Blakeslee as Wanda, Mrs. Turner, Anti-Wanda, Mrs. Dinkleberg, and Ms. Sunshine
 * Carlos Alazraqui as Denzel Crocker, Juandissimo, Mayor, Chompy the Goat, Sheldon Dinkleberg and Hank the Rhino
 * Grey DeLisle as Vicky, Tootie, Veronica Star, Chad, Principal Waxelplax, Tooth Fairy, Happy Peppy Betty and Ms. Sunshine/Doombringer
 * Frankie Muniz as Chester McBadbat #1 (2001–2003)
 * Jason Marsden as Chester McBadbat #2 (2003–present), Imaginary Gary
 * Ibrahim Haneef Muhammad as AJ #1 (2001–2003)
 * Gary LeRoi Gray as AJ #2 (2003–present)
 * Dee Bradley Baker as Elmer, Sanjay, Binky Abdul, The Bronze Kneecap, Thomas Jefferson, Remy Buxaplenty, Shallow-Grave, and Mr. Turner (as a kid)
 * Faith Abrahams as Francis
 * Dionne Quan as Trixie Tang, Tina Tang
 * Rob Paulsen as Mark Chang, King Gripploun, Bucky McBadbat and Happy Peppy Gary
 * Jim Ward as Mr. Bickles, Doug Dimmadome, Vicky's Dad, Chet Ubetcha and Dr. Rip Studwell (Hard Copy)
 * Jane Carr as Mama Cosma
 * Tony Sirico as Big Daddy
 * Tom Kenny as Cupid
 * Kevin Michael Richardson as Dark Laser and AJ's Dad
 * Ben Stein as The Pixies
 * Chris Kirkpatrick as Chip Skylark
 * Adam West as Himself, Catman
 * Jay Leno as the Crimson Chin and the Nega Chin
 * Gilbert Gottfried as Dr. Bender and Wendell
 * Robert Cait as Norm the Genie (Fairy Idol)
 * Norm Macdonald as Norm the Genie (Other appearances)
 * S. Scott Bullock as Flappy Bob
 * Method Man as Pixie Rapper
 * Alec Baldwin as Older Timmy
 * Steve Irwin as Bad Parent Hunter
 * Daisy Carson as AJ's Mom
 * Butch Hartman as Dr. Rip Studwell (Other appearances)
 * Laraine Newman as Queen Jipjorrulac
 * Frank Welker as Doidle
 * Tom Arnold as Santa
 * Robert Costanzo as Easter Bunny
 * Diana DeGarmo as Cosmo's Singing Voice (Fairy Idol)

Distributors

 * Nickelodeon
 * Nelvana Limited (Outside the United States)