Monster Mutt

Rhiannon Leigh Wryn

Ashley Taylor

Bart Johnson

Jeff Taylor

William Brent

Zack Taylor (as Billy Unger)

Zack Ward

Sirus Caldwell

Brian Stepanek

Dr. Victor Lloyd

Mindy Sterling

Helen

Juliet Landau

Natalya

Jacqueline Pinol

Tawni Martinez

Alastair Mackenzie

Monty

John Kassir

Destin Bigsby

Kim Fields

China Anderson

Abigail Bankston

Snotty Little Girl

Brandon Ellison

Eric Unger

School Boy

Bob Gibson

Monster Mutt (voice)

Amber Frank

School Kid

Isabelle Miranda

School Kid

Zachary Montana

School Kid