Jeremy Ray Taylor

Sonny Quinn

Madison Iseman

Sarah Quinn

Caleel Harris

Sam

Wendi McLendon-Covey

Kathey Quinn

Ken Jeong

Mr. Chu

Chris Parnell

Walter

Bryce Cass

Tyler

Peyton Wich

Tommy

Shari Headley

Mrs. Carter

Christian Finlayson

Cooper

Matthew Jose Vasquez

Derek

Courtney Lauren Cummings

Jess

Jessi Goei

Maya

Drew Scheid

Tyler's Crew

Tyler Silva

Tyler's Crew

Sydney Bullock

Vanessa

Jason Looney

Terrified Parent Monster-Mr. Rennie

Kendrick Cross

Sam's Father

Déjá Dee

Mrs. Hoover

Brick Jackson

Paramedic- TJ

Krishnan Viren Patel

Pharmacist

Hallie Jackson

Nana

R.L. Stine

Science Award Presenter-Principal Harrison

Kent Wagner

Dead Pirate

Barry W. Jerald Jr.

Alien

Mary Tricia Froedge

Mummy

Grace Toso

Mummy

Joe Marri

Goblin

Cody Jenkins

Goblin

Joseph N. Hardin

Vampire

Mick Wingert

Slappy (voice)

Jack Black

R. L. Stine (uncredited)

Jasmine Bolton

Middle School Kid (uncredited)

Darin De Paul

Terry / Angry Pumpkin (voice) (uncredited)

Suehyla El-Attar

Teacher in Hole (uncredited)

Catherine Jerald

Monster (uncredited)

Sawyer D. Jones

Trick-or-Treater (uncredited)

Gracie Marcellus

Middle Schooler (uncredited)

Shaun McMillan

Middle School Principal (uncredited)

Ivy O'Brien

(uncredited)

Arianna Jones

Cheerleader