To celebrate their graduation, the teenagers from Valley Hills High School have organized an ’80s-themed party at the old Wet Valley water park. Things turn gruesome when it's revealed that a mysterious maniac has inserted giant razor blades into one … Nicolas Fontaine, Brittany Drisdelle, Madeline Harvey, Paul Zinno, Nick Walker, Chip Chuipka, Howard Rosenstein Added on Amazon Prime 2023-03-27. Youtube Trailer