Plot: After the events of "Ice Age: The Meltdown", life begins to change for Manny and his friends: Scrat is still on the hunt to hold onto his beloved acorn, while finding a possible romance in a female sabre-toothed squirrel named Scratte. Manny and Ellie, having since become an item, are expecting a baby, which leaves Manny anxious to ensure that everything is perfect for when his baby arrives. Diego is fed up with being treated like a house-cat and ponders the notion that he is becoming too laid-back. Sid begins to wish for a family of his own, and so steals some dinosaur eggs which leads to Sid ending up in a strange underground world where his herd must rescue him, while dodging dinosaurs and facing danger left and right, and meeting up with a one-eyed weasel known as Buck who hunts dinosaurs intently.
Alternative Plot: After Sid (John Leguizamo) pilfers some dinosaur eggs, Manny (Ray Romano), Diego (Denis Leary) and the rest of their prehistoric pals enter a mysterious, underground world to rescue the hapless sloth. During the course of their mission, the gang encounters many creatures great and small, including hungry carnivores and a relentless, dinosaur-hunting weasel named Buck.
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