Diego the Sabertooth (voice of Denis Leary) is actually setting up Manfred the Mammoth (Ray Romano), to return to the sabertooth lair to be eaten. Diego realizes that what he is doing is wrong, and gives his life defending Manfred. Manfred and Sid the Sloth (John Leguizamo) return the baby to his parents. It turns out that Diego didn't die. The three of them head South for migration.
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