When a mysterious monster rises from the Mekong River and attacked Bueng Kan, cuts off people from the outside world. Officials and people in the area, including Chinese scientists who accidentally came to conduct research in Thailand, all forces must be mobilized to catch this crazy monster before it's too late. A girl finds a strange egg and brings it back to her village, only to later realize it was from a monster. Now a giant monster emerges from the lake to search for the egg, destroying the town and its inhabitants.