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, in fact, is not the last of the woolly mammoths.

A struggling actress inherits a bevy of colorful villains after desperation (with a touch of femme fatale) drives her and her gullible boyfriend to steal big from the Los Angeles underworld.

The story revolves around sub-zero heroes: a woolly mammoth, a saber-toothed tiger, a sloth and a prehistoric combination of a squirrel and rat, known as Scrat.

Zombie nudists attack campers five years after the closure of the Sunny Buttocks nudist colony in various musical numbers.