While I didn't think Ice Age - The Meltdown boasted a particularly memorable storyline, it's still a five star, very funny movie all the way through. The filmmakers tend to milk things a little too far in my opinion, especially when it comes to the poor old saber-toothed squirrel just trying to get a nut, and let's face it, a wooly mammoth that thinks she's an opossum is just plain silly - even though it, like everything else, actually manages to work pretty darn well in this movie.
As far as the story goes, Manny (Ray Romano) the wooly mammoth, Diego (Denis Leary) the saber-tooth tiger, and Sid (John Leguizamo) the sloth have to lead all of their Arctic friends to safety when their icebound home is threatened by meltdown-generated flooding (thankfully, without the story goose-stepping to today's environmentalist wacko hysteria). Along the way, they pick up Ellie (Queen Latifah) and her two opossum brothers. It takes most of the journey for Manny to convince Ellie that she is not actually a wooly mammoth (which is particularly important to Manny, as he was beginning to fear he was the last of his kind). The gang face all sorts of dangers they must overcome (and fears they must conquer) if they are to survive. On paper, it's all pretty formulaic, but the winsome depth of the characters and of course the extraordinary animation makes for a consistently funny, exciting adventure.
Sid (Leguizamo) steals the show time and time again in my opinion, but everyone will latch on to one favorite character or another. The climax is actually pretty exciting and heart-warming, helping make this a film you can't help but enjoy immensely. Ice Age - The Meltdown doesn't distinguish itself the way, for example, Cars does, but it's definitely a film the whole family will enjoy.