The Ice Age is coming, and animals are in a hurry to migrate to warm places and store food. In order to help a human baby return to his parents, Mamfred the mammoth, Sid the sloth, and Diego the saber-toothed tiger left the migrating team. The three animals, with different personalities, decided to join forces to help the baby. Along the way, the kind-hearted Manfred always felt that Diego had ulterior motives and wanted to eat the baby, and they were suspicious of each other. They went through countless hardships and obstacles together, and finally they were able to face each other sincerely. When Diego's companions knew that there was a baby next to him, they were starving and wanted Diego to give the baby to them as food. Diego had developed feelings for the cute baby and couldn't do it. What should Diego choose? Can the baby return home safely?