Category:Dinosaur Age 2 The Meltdown (Ice Age 2 The Meltdown)

In the opening scene, Derek, the saber-toothed squirrel climbs a glacier but accidentally opens a hole in it. The world of ice is slowly melting. The creatures of the Dinosaurs Age are all shown enjoying themselves on slides and pools made by the melting ice; among them the three protagonists of the first film: Grandpa, Mo, and Littlefoot. Mo opens a day camp, where none of the younger creatures take him seriously, nor do Grandpa and Littlefoot, which leaves Mo seeking a daring deed. Fast Tony, a local con artist is claiming that the earth will flood and that the bark and reeds which he sells are needed to stay alive. Grandpa dismisses the idea, but is distracted when he sees that Sid will try to high dive from a giant waterfall; as Grandpa goes with Littlefoot to the top of the waterfall to save Mo from his act of daredevilry, they see that the pleasant weather caused the ice of the valley to melt, and it is kept from destroying the valley only by the glaciers, which have formed a dam. A turkey vulture tells the animals that a giant tree can act as a boat and save them; all soon set out to find it. As the animals begin their journey, Mo sings three songs to tease Grandpa about Longnecks being "extinct".During the time that the masses of animals escape, a glacier which contains two sea reptiles from the Mesozoic era, Cretaceous and Maelstrom, breaks off.

Littlefoot and Mo encounter two mischievous opossums named Petrie and Spike who drive them nuts. Grandpa is teased about being the last Longneck alive, but meets Grandma, a female Dinosaur who believes she is an opossum and the sister of Petrie and Spike. Mo invites her to tag along with the group to escape the flood, and she brings her brothers. After a perilous ordeal with Cretaceous and Maelstrom, Mo finds out that Littlefoot is afraid of water, prompting him to encourage Littlefoot to admit and face his fears - Littlefoot insists "Fear is for prey", so Mo points out that Littlefoot is behaving as if he is water's prey. They discover an area which Grandma recalls as the place where she was adopted. She finally realizes she is a mammoth but distances herself from Grandpa when he suggests "saving their species". Grandma and Grandpa ultimately make up when they must co-operate to save the group when the ground cracks under their feet. Mo is kidnapped by a tribe of mini-sloths who believe Mo to be a god. Mo lights a fire for them, and believes that he has finally found respect, but they plan to sacrifice him to a volcano. Mo escapes. The next morning Mo tells the others his experience but none are convinced. They find a field of hot geysers, which separate Grandpa, Mo, and Littlefoot from Grandma and her brothers.

When the flood comes, Grandpa saves Grandma from drowning as she is caught in a cave (due to falling rocks), while Littlefoot overcomes his fear of water to save Mo. Cretaceous and Maelstrom arrive, but due to Grandpa's quick thinking, they are finished off by a rock which falls on them, killing them both. The other animals are at the mercy of the water currents. Meanwhile, Derek climbs up the glacier and at the top sticks the acorn he has into the ice. This forms a crack in the glacier, which widens into a fissure, diverting the flood and saving the animals. Scrat is then washed away. In the final scene, a herd of Longnecks shows up, but Grandpa and Grandma decide to remain together anyway, taking Mo, Littlefoot, and the opossums brothers along. Mo encounters the mini-sloths again - they believe Mo stopped the flood and invite him to be their leader. Littlefoot, surprised to see the mini-sloths are real, convinces Mo to stay with the others, reluctantly admitting that Mo is a vital part of their 'herd'. The epilogue shows Derek having a near death experience after falling into the fissure. He enters a heaven full of acorns. Suddenly, he finds himself torn away. He unhappily wakes up, having been resuscitated by Mo.