In ancient times, life on the planet did not spoil the comfort of either people or animals. The first suffered from attacks of predators, severe weather conditions, lack of food. The second completely depended on the climate, and in a more privileged position were holders of sharp teeth and fast legs. Neither one nor the other could not boast of the mammoth Manfred and his reckless lazy friend Sid. The impending glacial period forces the heroes to migrate, and then the woman sinking in the river manages to pass on to her friends' friends, which adds trouble. The saber-toothed tiger Diego is taking the mammoth and sloth in the village of people, but this is only an insidious predator plan: its ultimate goal is to devour the human cub just like a flock of tigers killed the day before with the whole settlement. Diego leads the company into a trap, but on the way involuntarily gets to the beasts and their ward kindly feelings. The tiger no longer wants to eat a child, but on the contrary - is ready to protect him, and the fussy sloth, and the good-natured mammoth from the dangers on the way. And while the mammoth, sloth and tiger carry the baby to people, the crazy squirrel Scrat leads his own battle ... with a nut. Will the child be like him or be raised by animals? Will Skrat get a coveted nut, or is he getting more attractive prey? It's still a long way from the finals, but the time will pass by cheerfully and unnoticed.