Twenty thousand years ago, everywhere on the earth was covered with glaciers, and animals everywhere were fleeing to avoid the impact of the new ice age. At this critical moment, we meet the weirdest group of people we have ever seen in any era: a fast-talking, dull sloth named Sid (voiced by John Leguizamo) with a moody head. Manny, the woolly mammoth (voiced by Ray Romano), Diego, a ferocious saber-toothed tiger (Diego, voiced by Denis Leary), and the famous canine-toothed squirrel with a special fondness for acorns. Scrat. These four misfits are unexpectedly and reluctantly brought together because they hope to return a human baby to his father. They brave pits of boiling lava, hidden ice caves, frigid weather, and a secret, perhaps sinister, conspiracy. These "sub-zero" monsters became the worlds earliest heroes.
