Carlos Alazraqui
— Rocko / Spunky / Gordon / Mitch (voice)
Tom Kenny
— Heffer Wolfe / Dad Elf / Additional Voices (voice)
Charlie Adler
— Ed Bighead / Bev Bighead / George Wolfe / Grandpa Wolfe (voice)
Linda Wallem
— Dr. Hutchinson / Virginia Wolfe / Cindy Wolfe (voice)
Mr. Lawrence
— Filburt Turtle / Fruitcake Man (voice)