In the time since the events of the first film, the world of ice is slowly melting. While all the animals are enjoying pools and slides made of ice, Sid has opened a day care for animals, where nobody takes him seriously. A local con artist by the name of Fast Tony tells the animals that the Earth will flood. Although skeptical at first, the animals soon learn he is true when an ice slide of theirs breaks away. They learn the great flood will take place in three days and if they can get across the world to the Great Valley in that time, they can carve a boat out from the trunk of a large tree. Meanwhile, Manny is in doubt that he is the last mammoth alive and is in search for more. Scrat is also back and still in hot pursuit of his acorn.