Frank Braine, Leslie Morgan, Carla Fission, Paul Hampton, and other colleagues unexpectedly find themselves stranded when their vehicle breaks down. To make matters worse, an ion storm is approaching, and they must find shelter before it arrives. Along the way, several people become acquainted with McQueen, who is desperately searching for his son and leads them to a mysterious cabin. Everyone utilizes their unique skills to locate food, water, and restore power inside the cabin. However, that night, Frank Braine gets lost in the cabin, and when they find him, he is already a bloody mess. Disturbing roars echo intermittently, unsettling everyone. Leslie Morgan discovers a diary revealing that this place is a laboratory, and the subjects of the experiments are humans. McQueen asks Paul to fix the computer to check the list of those experimented on, but unexpectedly, Paul also meets a grim fate. As danger closes in on the remaining individuals, can they escape the cabin and uncover the true nature of the mysterious monster?