Fred Savage as Brian Stevenson

Howie Mandel as Maurice

Daniel Stern as Glen Stevenson

Margaret Whitton as Holly Stevenson

Rick Ducommun as Snik

Frank Whaley as Boy

Ben Savage as Eric Stevenson

William Murray Weiss as Todd

Devin Ratray as Ronnie Coleman

Amber Barretto as Kiersten

J. Michael Hunter as Mr. Finn

Tom Hull as Principal

Magbee as Bus Driver

Lisa Cain as Holly's Friend

Dana Wood as Arnold

Byron Faler as Schmoog

Doug Turner as St. Louis Monster

Donna Strickland as TV Guest

Howard Spiegel as Father

Jessica Hauser as Innocent Girl

Jessica Greenberg as Painted-Face Girl

Natanya Ross as Kid on Trial

Michael Weaver as Kid on Trial

Luke Greenberg as Kid on Trial

Morgan Greenberg as Kid on Trial

Alexander Knoll as Kid on Trial

Herbert Duarte as Kid on Trial

Kala Savage as Little Monster

Rachel Weiss as Little Monster

Matt Cavenaugh as Little Monster

Amy Holden as Little Monster

Stacy Pochowicz as Little Monster

Laura Winstead as Little Monster

Elise Schillmoller as Little Monster

Trent Jobin as Little Monster

Amy Plaskett as Little Monster

Ashley Broadfoot as Little Monster

Ginny Broadfoot as Little Monster

Jeremy Fowler as Little Monster

Scott Bayzle as Little Monster

Matthew Norton as Little Monster

Davy Beard as Little Monster

Darwin Brandis as Snorekill (uncredited)