Tyler's brought his girlfriend Soo back to his hometown of Footstep, a footnote of a town located on scenic Smoky Island. The first night they're there, Tyler and Soo go up to his parents' cabin in the middle of the nearby woods for some alone time. Because they're the only people on the far side of the island, they're thus the only ones on the island who are unaffected when the Bulge, a local inactive volcano, belches out a toxic cloud of gas.