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The ice age is approaching, and all the animals are rushing to migrate to warmer places and store food. Manny the woolly mammoth, Sid the sloth, and Diego the saber-toothed tiger set out to help a human baby return to his parents, thus falling out of the migrating animal group. The three animals with different personalities decide to combine their efforts to help the baby. Along the way, kind-hearted Manny always suspects that Diego has ulterior motives and wants to eat the baby, leading to mutual distrust. They go through countless hardships together and finally learn to be honest with each other. When Diego's saber-toothed tiger companions find out that there is a baby with him, they, suffering from hunger and cold, want Diego to hand over the baby as food. However, Diego has developed feelings for the cute baby and cannot bring himself to do it. How will Diego make his choice? And will the baby be able to return home safely?