Billy sees a strange black figure at school that disappears. When he tells his teacher, Mr. Jeffery, he is dismissed as imagining things and told he may have a mental disorder. The next day, when Billy disrupts class to "save" a student from the same figure, he is reprimanded. Later, students start disappearing, and during class the windows smash. Mr. Jeffery is then attacked by the black figure. Though initially fine, Mr. Jeffery then possesses another teacher. Billy tries to warn the class but they don't believe him. As the possessed teachers start attacking students, Billy leads the survivors to escape, but most are caught and possessed until only Billy remains.