- Octavia Spencer - Dr. Evilini
- Tiffany Thornton - Susan
- Christa B. Allen - Daphne
- Cole Sprouse - Cody Martin
- Taylor Negron - Dragon Seller
- Jack Plotnick - Pocket Elf
- Julie Brown - Miss Marinovich
- Mark DeCarlo - Voice of Cupid
- Yara Shahidi - Olive
- Chelsea Kane - Kari Landsdorf
- Bella Thorne - Nancy Lueke
- Belita Moreno - Magdalena Larkin
- Sarah Ramos - Isabella
- Jo Anne Worley - Maggie
- Rachel Dratch - H.J. Darling
- Lucy Hale - Miranda Hampson
- Shakira - Shakira
- Sean Whalen - Mantooth
- Zack Shada - Joey
- Wendi McLendon-Covey - Dr. Ice
- Jenica Bergere - Mother Nature
- Adam Carolla - Burt the Cab (voice)
- Debby Ryan - Bailey Pickett
- Melise - Ruby Donahue
- Eric Allan Kramer - Coach Gunderson
- Adam Irigoyen - New Conscience
- Curtis Armstrong - Justin's Zit
- Sara Paxton - Millie
- J. Evan Bonifant - Jerko Phoenix
- Michael Patrick McGill - Ump
- Gabrielle Dennis - Candace
- Heidi Swedberg - Miss Majorhealey
- Danielle Bisutti - Mona Lisa
- Nicole Scherzinger - Vanessa
- Carrie Genzel - Megan Russo
- John Capodice - Uncle Al
- Skyler Samuels - Gigi Hollingsworth
- Julia Duffy - Ms. Angela
- Daryl Sabara - T.J. Taylor
- Lauren Benz Phillips - Calico Girl
- John DeLuca - Tommy
- Brendan Bradley - Hank Russo
- Austin Butler - George
- Wayne Federman - Mr. Kaminsky
- Jordan-Claire Green - Kelly
- Chad Broskey - Brian
- Amanda Tepe - Hot Dog Vendor
- Amanda Tepe - Elaine
- Amanda Tepe - Hostess
- Amanda Tepe - Volcanoland Employee
- Amanda Tepe - Security Guard
- Amanda Tepe - Store Manager
- Amanda Tepe - Manager
- Amanda Tepe - Maître D'
- Bonnie Burroughs - Mrs. Taylor
- Dink O'Neal - Mr. Taylor
- Veronica Sixtos - Nellie Rodriguez
- Monica Lee Gradischek - Doris
- Jeffrey Christopher Todd - Jeffrey
- Brian Kubach - Riley
- Britt Prentice - Babe Ruth
- Mark Rickard - Vincent Van Gogh
- Andy Pessoa - Alfred
- Brian Scolaro - Goblin
- Michael Shepperd - Officer Lamp
- Noah Munck - Timmy O'Hallahan
- Chad Duell - Ronald Longcape Jr.
- Maurice Godin - Ronald Longcape Sr.
- John Ross Bowie - Simon
- Cindy Crawford - Bibi Rockford
- Willie Garson - Mr. Frenchy
- Dwayne Johnson - Himself
- Kristi Lauren - Chelsea
- Rob Reiner - Himself
- Gilland Jones - Jenny Majorhealey
- Clarinda Ross - Cathy Normous
- Lee Reherman - Doug Normous
- Christopher Neiman - Stu Fineman
- Rose Abdoo - Mary Lou Fineman
- Paulina Olszynski - Tutor
- Dana Woods - Leprechaun
- Amir Talai - Alien
- Dylan Sprouse - Zack Martin
- Paulie Litt - Frankie
- Paulie Litt - Joey
- Brenda Song - London Tipton
- Phill Lewis - Marion Moseby
- Mary K. DeVault - Mary
- JD Cullum - Alucard van Heusen
- Anne Ramsay - Cindy van Heusen
- David Boller - Abe Lincoln
- Jay Brian Winnick - Mr. McFly
- Keith Allan - Wally
- Stephen A.F. Day - Frank
- Perry Mattfeld - FrankenGirl
- Perry Mattfeld - Frankengirl
- Fred Willard - Mr. Stuffleby
- Pat Finn - Luxor
- Gregg Binkley - Randy
- Moisés Arias - Conscience
- Pamela Chan - Carol
- John Eric Bentley - Mummy
- Grant Alan Ouzts - Eddie
- Jeff Garlin - Kelbo Russo
- Hayley Kiyoko - Stevie Nichols
- Richard Chiu - Warren Nichols
- Ted McGinley - Superintendent Clanton
- James Cavlo - August Salvatore
- Al Madrigal - Mexican Pocket Elf
- Rachel Cannon - Flutter
- John O'Hurley - Captain Jim Bob Sherwood
- Kate Flannery - Elaine Finkle
- Scot Anthony Robinson - Marty Finkle
- Wilmer Valderrama - Ernesto Larkin
- Bridgit Mendler - Juliet van Heusen
- Laura Ashley Samuels - Sara
- Mary-Pat Green - Ma
- Gary Grubbs - Pa
- Chad W. Smathers - Junior
- Jonathan Kite - Agent Lamwood
- David Barrera - Carlos Cucuy
- Samantha Boscarino - Lisa Cucuy
- Roxana Brusso - Julie Cucuy
- Shoshana Bush - Tyler
- Daniel Samonas - Dean Moriarty
- Shane Harper - Fidel
- Kari Wahlgren - Helen
- Lanny Joon - Sensei
- Ransford Doherty - Zeedrik
- Leven Rambin - Rosie
- China Anne McClain - Tina
- Natalie Alyn Lind - Marisa
- L.J. Benet - Little Crumbs
- Jackie Evancho - Jackie Evancho
- Bailee Madison - Maxine Russo
- Valente Rodriguez - Muy Macho
- Robin Riker - Linda Greybeck
- Harry Van Gorkum - Grant Greybeck
- Justin Guarini - Keith Keith
- Nick Roux - Chase Riprock
- Tim Conway - Cragmont
- Michael Carbonaro - Zelzar
- Michael Carbonaro - The Robot
- Joely Fisher - Meg Robinson
- McKaley Miller - Talia
- Travis Caldwell - Donny
- Linsey Godfrey - Lucy
- Gregg Sulkin - Mason Greyback
- Regan Burns - Everett Appleton
- Daryl Mitchell - Scientist One
- Bill Chott - Mr. Laritate
- Josh Sussman - Hugh Normous
- Ian Abercrombie - Professor Crumbs
- Andy Kindler - Chancellor Tootietootie
- John Rubinstein - Gorog
- Frank Pacheco - Felix
- Fred Stoller - Dexter
- Melissa Barker - Western Show Girl (uncredited)
- Ada Mogilevsky - Stacey
- Carlo Manchini - Lenny Hune
- David Copperfield - Self
- Bridge Barrera - Little Girl
- Jim Wise - Mr. Malone
- Courtenay Taylor - News Reporter
- Lei'lah Star - Kid Student
- Lei'lah Star - Student
- Chris Reed - Ogre
- Adam Bay - Richard
- Cameron Sanders - Nelvis
- Marianne Muellerleile - Fake Linda Greybeck / Molly
- Eric Zuckerman - Fake Grant Greybeck / Bill
- John J. York - Hal Art
- Timothy 'TJ' James Driscoll - Mustache Man (uncredited)
- Candace Brown - Genie
- Monica Anne Parales - Wendy Bott
- Christopher Johnson - Friend #1
- Adam Conger - Hot Dog Guy
- Craig Watkinson - Soda Can Guy
- Todd J. Greenwald
- Perry Rein
- Gigi McCreery
- Peter Murrieta
- Vince Cheung
- Ben Montanio
- Selena Gómez
Willie Garson hace el papel de Mr. Frenchy.
Marianne Muellerleile interpreta a Fake Linda Greybeck / Molly en la serie.
Joely Fisher interpreta a Meg Robinson en la serie.
Rob Reiner hace el papel de Himself.
David Henrie interpreta a Justin Russo en la serie.
Jake T. Austin interpreta a Max Russo en la serie.
Jennifer Stone interpreta a Harper Finkle en la serie.
David DeLuise interpreta a Jerry Russo en la serie.
Maria Canals-Barrera interpreta a Theresa Russo en la serie.
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