Danielle Panabaker

Maddy

Matt Bush

Barry

Katrina Bowden

Shelby

Jean-Luc Bilodeau

Josh

David Koechner

Chet

Chris Zylka

Kyle

Adrian Martinez

Big Dave

Paul James Jordan

Travis

Meagan Tandy

Ashley

David Hasselhoff

David Hasselhoff

Christopher Lloyd

Mr. Goodman

Paul Scheer

Andrew

Gary Busey

Clayton

Clu Gulager

Mo

Sierra Fisk

Bethany

Matt Lintz

Freckled Boy

Sylvia Jefferies

Young Mother

Jenna Hurt

Rochelle

Rozlyn Papa

Dawn

Alisa Harris

Hysteric / Stocky Woman

Stacy Rabon

Fearful Woman

Nate Panning

Waterpark Patron

Kathy Sue Holtorf

Bimbo Lifeguard

Irina Voronina

Kiki

Ving Rhames

Deputy Fallon (uncredited)

Sarah Wilson

Massacre victim (uncredited)

Katie Garner

Lizzie the Lifeguard (uncredited)

Tabitha Taylor

Lifeguard (uncredited)