In Whoville, live the Whos, an almost mutated sort of munchkinlike people. All the Whos love Christmas, yet just outside of their beloved Whoville lives the Grinch. The Grinch is a nasty creature that hates Christmas, and plots to steal it away from the Whos which he equally abhors. Yet a small child, Cindy Lou Who, decides to try befriend the Grinch.

Humans and Transformers are at war, Optimus Prime is gone. The key to saving humanity's future lies buried in the secrets of the past, in the hidden history of Transformers on Earth.