Greg Eagles

~ as ~

Grim / Sperg (voice)

Richard Steven Horvitz

~ as ~

Billy / Billy's Dad (voice)

Grey DeLisle

~ as ~

Mandy (voice)

Vanessa Marshall

~ as ~

Irwin (voice)

Kari Wahlgren

~ as ~

Velma Green the Spider Queen (voice)

Maxwell Atoms

~ as ~

Jeff the Spider (voice)

Dee Bradley Baker

~ as ~

Chocolate Cow (voice)

Jennifer Hale

~ as ~

Gladysaur (voice)

Chris Cox

~ as ~

Principal Goodvibes (voice)

Jane Carr

~ as ~

Pud'n (voice)