During the Ice Age 20, 000 years ago, the super-unreliable Sid (voiced by John Regizamo John Leguizamo) led beavers, anteaters and baby tooth sculptors on camping trips. Sid calls himself the owner of the forest and the son of nature, but he doesn't seem to have any experience of living in the wild. First he was stung by a wasp and fell off a cliff, and then the kids got lost under his leadership. Sid also mistakenly tasted the poisonous plant's head swollen like a ball. Despite the mistrust and disdain from the little guys, the super-confident guy was unmoved and continued to go further and further along his stupid road. At this moment, neither Sid nor the babies thought what a magical landscape and history his unintentional behavior would create. This film is a short story about the Ice Age.