A Halloween-themed dance party at the Nassau Coliseum turned into a horror show when at least 50 underage revelers were hospitalized for booze and drug use, sources said.

The massive event, called the Haunted Coliseum, attracted thousands. It was shut down early after someone reported a sick teen at around 9:50 p.m., sources said.

The DJ’s screeched to a halt when dozens of police cars and ambulances rushed to the scene, sources said. Responders found dozens of young people passing out and throwing up, sources added.