Two monsters living on opposite sides of a mountain, who can't agree on whether day is arriving or night departing, insult each other and hurl rocks until the mountain is destroyed and they make a startling discovery.
A little boy, hearing noises at his window at bedtime, calls for his mother. His worst fears are realized, but he learns that monsters have mothers too.
Four high school students face off against a soul-stealing beast that has been making young people disappear from their small Ontario, Canada, town for centuries.