Jeremy Ray Taylor
Sonny Quinn
Madison Iseman
Sarah Quinn
Wendi McLendon-Covey
Kathey Quinn
Christian Finlayson
Cooper
Courtney Lauren Cummings
Jess
Jason Looney
Terrified Parent Monster-Mr. Rennie
Kendrick Cross
Sam's Father
Brick Jackson
Paramedic- TJ
Krishnan Viren Patel
Pharmacist
R.L. Stine
Science Award Presenter-Principal Harrison
Katharine C. Lumpkin
Monster Bride
Iyani Gwendolyn
Day of the Dead Lady
Cheniqua Litchmore
Day of the Dead Lady
Hali J. Ross
Day of the Dead Lady
Scott Millican
Red Haired Ghoul
Benjamin Bladon
Royal Mummy
Mick Wingert
Slappy (voice)
Jack Black
R. L. Stine (uncredited)
Braylon Andrews
Club Goer / Highschool Student (uncredited)
Kaitlyn Bishop
Middle School Student (uncredited)
Jasmine Bolton
Middle School Kid (uncredited)
Raphael Dante' Carr Jr.
Trick or Treater (uncredited)
Darin De Paul
Terry / Angry Pumpkin (voice) (uncredited)
Suehyla El-Attar
Teacher in Hole (uncredited)
Natsuki Hirota
Party Goer (uncredited)
Lacy Hudson
Trick-or-Treater (uncredited)
Catherine Jerald
Monster (uncredited)
Sawyer D. Jones
Trick-or-Treater (uncredited)
Serene Lee-Sng
School Teacher (uncredited)
Natalya MacDonald-Risner
Cowgirl Trick-or-Treater (uncredited)
Gracie Marcellus
Middle Schooler (uncredited)
Shaun McMillan
Middle School Principal (uncredited)