In 1989, one year after the events of the Sleepaway Camp II: Unhappy Campers, new character Maria is heading to camp. Suddenly, she is chased into an alleyway by a large truck, driven by serial killer Angela Baker, before being run over. Angela disposes of the body in a trash compactor and poses as Maria in order to board the bus to Camp New Horizons, which was once Camp Rolling Hills where Angela massacred campers the year before. After arriving, news reporter Tawny Richards interviews the many campers who are taking part in "an experiment in sharing," seeing different social classes living together. Tawny asks Angela to get her some cocaine, however Angela gives her Ajax cleaner instead, which kills Tawny when she snorts it.