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 Sydney Bullock Vanessa Jason Looney Terrified Parent Monster-Mr. Rennie Kendrick Cross Sam's Father Deja Dee Mrs. Hoover Mick Wingert Slappy (voice) Jack Black R. L. Stine (uncredited) 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 Sydney Bullock Vanessa Jason Looney Terrified Parent Monster-Mr. Rennie Kendrick Cross Sam's Father Deja Dee Mrs. Hoover Brick Jackson Paramedic- TJ R.L. Stine Science Award Presenter-Principal Harrison 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) Ben O'Brien (uncredited)

Kadaikutty Singam

Yevadu 2