Explorers in Mexico uncover the ruins of an ancient snake-worshiping civilization. Celebration turns to horror when they awaken an ever-growing anaconda, starved of human sacrifices for centuries. Now, the team must band together to survive.

When cutting-edge research leads to the creation of living dinosaurs, a team of scientists on a secluded island must risk their lives and confront the now-growing creatures to prevent the animals from escaping and attacking the mainland.