Diego, Manny and Sid return in this sequel to the hit animated movie Ice Age. This time around, the deep freeze is over, and the ice-covered earth is starting to melt, which will destroy the trio's cherished valley. The impending disaster prompts them to reunite and warn all the other beasts about the desperate situation.
Manny, Sid and Diego discover that the ice age is coming to an end, and join everybody for a journey to higher ground. On the trip, they discover that Manny is not in fact the last of the woolly mammoths.