A father, a son, and a daughter—played by Peter Graves, George O’Hanlon Jr., and Kathleen Quinlan—are camping in the California mountains when something unusual occurs in the sky. They have to make their way down toward the closest town to figure out what's going on. But the village is unsettlingly quiet, and all of its residents are…gone. Verna Bloom portrays a woman who’s still alive but deeply traumatized. Thou…