Hello Mary Lou: Prom Night II (1987, CDN) C-96m. **½ D: Bruce Pittman. Starring Michael Ironside, Wendy Lyon, Justin Louis, Lisa Schrage, Richard Monette, Terri Hawkes. Thirty years after the accidental burning of the prom queen, the lady returns from the grave to possess beautiful teenager Lyon. Some nasty killings ensue. This sequel really only has the principal theme in common with the first film. It's well-directed, well-filmed to make up for some plot deficiencies. Movie references range from THE EXORCIST (1973) and CARRIE (1976) to the NIGHTMARE ON ELM STREET movies. Recommended to buffs. Also known as THE HAUNTING OF HAMILTON HIGH. Followed by two more sequels.