Timeless Saviors: The Creature Conundrum

Harold is just relaxing in his house with some of his friends. They are near the window. Suddenly, the whole sky turns blackish gray with barely any light. Fog appears. Then, they hear some animalistic noises coming from outside the window. Harold looks through the peephole. Who…or what…is out there? Will these creatures destroy them? Or will unlikely heroes come knocking–and falling–to help him save his town?