Jeremy Ray Taylor

Sonny

Madison Iseman

Sarah

Caleel Harris

Sam

Mick Wingert

Slappy (voice)

Wendi McLendon-Covey

Kathy

Ken Jeong

Mr. Chu

Chris Parnell

Walter

Bryce Cass

Tyler

Peyton Wich

Tommy Madigan

Shari Headley

Mrs. Carter

Christian Finlayson

Cooper

Matthew J. Vasquez

Derek

Courtney Lauren Cummings

Tyler's Crew

Jessi Goei

Tyler's Crew

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

Katharine C. Lumpkin

Monster Bride

Kent Wagner

Dead Pirate

Marsha Shackelford

Cyborg

Barry W. Jerald Jr.

Alien

Mary Tricia Froedge

Mummy

Robert Hunt

Mummy

Skyler Martin

Mummy

Grace Toso

Mummy

Calvin Wickham

Mummy

Taylor Williams

Mummy

Iyani Gwendolyn

Day of the Dead Lady

Cheniqua Litchmore

Day of the Dead Lady

Hali J. Ross

Day of the Dead Lady

Joe Marri

Goblin

Cody Jenkins

Goblin

Sherri Millican

Banshee

Ben Bladon

Royal Mummy

Jack Black

R.L. Stine (uncredited)

Darin De Paul

Terry / Angry Pumpkin (voice) (uncredited)

Suehyla El-Attar Young

Teacher in Hole (uncredited)

Sawyer D. Jones

Trick-or-Treater (uncredited)

Ivy O'Brien

Student (uncredited)

Arianna Jones

Cheerleader (uncredited)