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Greg Eagles
Grim / Sperg (voice)
Richard Steven Horvitz
Billy / Billy's Dad (voice)
Grey DeLisle
Mandy (voice)
Vanessa Marshall
Irwin (voice)
Kari Wahlgren
Velma Green the Spider Queen (voice)
Maxwell Atoms
Jeff the Spider (voice)
Dee Bradley Baker
Chocolate Cow (voice)
Jennifer Hale
Gladysaur (voice)
Chris Cox
Principal Goodvibes (voice)
Jane Carr
Pud'n (voice)
Henry Gibson
Lord Pain (voice)
Phil LaMarr
Mr. Spleen (voice)