 | Danielle Panabaker als Maddy |
 | Matt Bush als Barry |
 | Katrina Bowden als Shelby |
 | Jean-Luc Bilodeau als Josh |
 | David Koechner als Chet |
 | Chris Zylka als Kyle |
 | Adrian Martinez als Big Dave |
 | Paul James Jordan als Travis |
 | Meagan Tandy als Ashley |
 | David Hasselhoff als David Hasselhoff |
 | Christopher Lloyd als Mr. Goodman |
 | Paul Scheer als Andrew |
 | Gary Busey als Clayton |
 | Clu Gulager als Mo |
 | Sierra Fisk als Bethany |
 | Matt Lintz als Freckled Boy |
 | Sylvia Jefferies als Young Mother |
| Jenna Hurt als Rochelle |
 | Rozlyn Papa als Dawn |
 | Alisa Harris als Hysteric / Stocky Woman |
 | Stacy Rabon als Fearful Woman |
 | Nate Panning als Waterpark Patron |
 | Kathy Sue Holtorf als Bimbo Lifeguard |
 | Irina Voronina als Kiki |
 | Ving Rhames als Deputy Fallon (uncredited) |
 | Sarah Wilson als Massacre victim (uncredited) |
| Katie Garner als Lizzie the Lifeguard (uncredited) |
| Lilith Fury als Wet T-Shirt Girl (uncredited) |
 | Tabitha Taylor als Lifeguard (uncredited) |
| John Gulager | Director |
| Marcus Dunstan | Writer |
| Patrick Melton | Writer |
| Joel Soisson | Writer |
| Pete Goldfinger | Characters |
| Josh Stolberg | Characters |
| Mark Canton | Producer |
| Joel Soisson | Producer |
| Marc Toberoff | Producer |
| Elia Cmiral | Original Music Composer |
| Alexandre Lehmann | Director of Photography |
| Martin Bernfeld | Editor |
| Devin C. Lussier | Editor |
| Kirk M. Morri | Editor |
| Nancy Nayor | Casting |
| Ermanno Di Febo-Orsini | Production Design |
| Matt Friedman | Music Editor |
| Thurston Edwards | Set Decoration |
| Carol Cutshall | Costume Design |
| Kari Delaney | Key Hair Stylist |
| Holly Sago | Key Makeup Artist |
| Cecilia Veradi | Makeup Department Head |
| Alisa Fredericks | First Assistant Director |
| Emma Madeline Ross | Art Department Coordinator |
| Trip Brock | Supervising Sound Editor |
| Peter D. Lago | Sound Effects Editor |
| Alexander Pugh | Sound Effects Editor |
| David Beavis | Special Effects Supervisor |
| Jeff Lietz | Visual Effects Supervisor |
| John Copeman | Stunt Coordinator |
| Catherine Bayley | Key Costumer |
| Victor M. Giarrusso | Costume Supervisor |
| Mike Flicker | Supervising Music Editor |
| Richard Glasser | Music Supervisor |
| Amber Harley | Script Supervisor |
| Jason Salzman | Production Coordinator |
| Harvey Weinstein | Executive Producer |
| Bob Weinstein | Executive Producer |
| Ian Shedd | Dialogue Editor |
| Jackie Johnson | Dialogue Editor |
| Bo Webb | "A" Camera Operator |
| Pratik Chaudhari | Visual Effects |
| Jennifer Badger | Stunt Double |
| Ashley Cusato | Utility Stunts |
| Angelique Fawcette | Stunt Double |
| Jeremy Owens | Stunts |
| Dino Muccio | Utility Stunts |
| Tina Fuchs Wanner | Stunt Double |
