Allison Kramer suffers recurring nightmares and selective amnesia, returning to camp to discover the truth as the secrets of infamous killer Angela Baker are revealed. [Production for this sequel to 'Sleepaway Camp III' (1989) was shut down after Double Helix Films went bankrupt in 1992, though the film was officially completed using archive footage and released on-demand beginning in 2012.]
A blazing fire rips its way through Bear Valley National Park. As the firefighters try to contain it, the animals are being forced out of their habitat including a beast that was better left undiscovered.
After a violent storm, a dense cloud of mist envelops a small Maine town, trapping David Drayton and his five-year-old son in a local grocery store with other local residents. They soon discover that the mist conceals deadly horrors that threaten their lives, and worse, their sanity.
Psychotic Angela is itching to do what she does best: slaughter dozens of teenage campers. As luck would have it, the previous site of her murders has been renamed and converted into an experimental summer camp meant to bring together privileged and lower-class teens. On the day the youths are boarding the buses to camp, Angela runs over a potential camper with a garbage truck and assumes her identity. Once she has infiltrated the camp, the real terror begins.