In 1940, the world is besieged by World War II. Wendy, all grown up, has two children; including Jane, who does not believe Wendy's stories about Peter Pan.
Littlefoot and his friends return in another adventure. But this time, they aren't the smallest dinosaurs in the valley anymore.
When the sky really is falling and sanity has flown the coop, who will rise to save the day? Together with his hysterical band of misfit friends, Chicken Little must hatch a plan to save the planet from alien invasion and prove that the world's biggest hero is a little chicken.