Jeremy Ray Taylor as Sonny Quinn

Madison Iseman as Sarah Quinn

Caleel Harris as Sam Carter

Wendi McLendon-Covey as Kathy Quinn

Ken Jeong as Mr. Chu

Chris Parnell as Walter

Bryce Cass as Tyler

Peyton Wich as Tommy Madigan

Shari Headley as Mrs. Carter

Christian Finlayson as Cooper

Matthew J. Vasquez as Derek

Courtney Lauren Cummings as Jess

Jessi Goei as Maya

Drew Scheid as Tyler's Crew

Tyler Silva as Tyler's Crew

Sydney Bullock as Vanessa

Jason Looney as Terrified Parent Monster-Mr. Rennie

Kendrick Cross as Sam's Father

Déjá Dee as Mrs. Hoover

Brick Jackson as Paramedic- TJ

Krishnan Viren Patel as Pharmacist

Hallie Jackson as Nana

R.L. Stine as Science Award Presenter-Principal Harrison

Katharine C. Lumpkin as Monster Bride

Marsha Shackelford as Cyborg

Barry W. Jerald Jr. as Alien

Mary Tricia Froedge as Mummy

Robert Hunt as Mummy

Martin Skyler as Mummy

Grace Toso as Mummy

Calvin Wickham as Mummy

Taylor Williams as Mummy

Iyani Gwendolyn as Day of the Dead Lady

Cheniqua Litchmore as Day of the Dead Lady

Hali J. Ross as Day of the Dead Lady

Joe Marri as Goblin

Cody Jenkins as Goblin

Sherri Millican as Banshee

Scott Millican as Red Haired Ghoul

Joseph N. Hardin as Vampire

Alex T. Hill as Scarecrow

Benjamin Bladon as Royal Mummy

Mick Wingert as Slappy (voice)

Jack Black as R. L. Stine (uncredited)

Braylon Andrews as Club Goer / Highschool Student (uncredited)

Kaitlyn Bishop as Middle School Student (uncredited)

Jasmine Bolton as Middle School Kid (uncredited)

Raphael Dante' Carr Jr. as Trick or Treater (uncredited)

Darin De Paul as Terry / Angry Pumpkin (voice) (uncredited)

Suehyla El-Attar Young as Teacher in Hole (uncredited)

Natsuki Hirota as Party Goer (uncredited)

Lacy Hudson as Trick-or-Treater (uncredited)

Catherine Jerald as Monster (uncredited)

Sawyer D. Jones as Trick-or-Treater (uncredited)

Serene Lee-Sng as School Teacher (uncredited)

Natalya MacDonald-Risner as Cowgirl Trick-or-Treater (uncredited)

Gracie Marcellus as Middle Schooler (uncredited)

Shaun McMillan as Middle School Principal (uncredited)

Ivy O'Brien as (uncredited)

Arianna Jones as Cheerleader