You are a passenger aboard Flight 727. Halfway through the flight, screams erupt from the back of the cabin as a snake attacks a passenger. Soon, more snakes begin appearing throughout the aircraft. Panic spreads, communications become chaotic, and survival becomes the only priority. The snakes behave unnaturally aggressively due to powerful pheromones that have been released throughout the aircraft. The scent drives them into a heightened, frenzied state, causing them to attack humans and react violently to movement and noise. Instead of avoiding people like normal snakes would, they actively strike at passengers, swarm through the cabin, and become increasingly dangerous as the pheromone spreads. The confined space of the aircraft turns the chemically-induced aggression into a deadly outbreak of chaos. Many different variants snakes, from small to big, all have different deadly venomous.