In a charming town called Whoville, the Christmas season is approaching, and the joyous residents are preparing for their festive celebrations. High above Whoville lives the Grinch, a grumpy and reclusive creature with a heart "two sizes too small," who is deeply annoyed by the Whos' exuberant holiday spirit. Determined to put an end to their merriment, the Grinch devises a devious plan to steal Christmas by disguising himself as Santa Claus and sneaking into the town at night. Accompanied by his loyal dog Max, dressed as a reindeer, he begins sabotaging the Whos' Christmas by taking their decorations, presents, and even their food.

The Grinch's elaborate heist seems to go off without a hitch, and he believes he has successfully ruined Christmas for the Whos. However, as dawn breaks and the citizens awaken to find their beloved holiday seemingly destroyed, an unexpected reaction from the townsfolk causes the Grinch to pause and reflect on his actions. Through this experience, the Grinch learns an important lesson about the true essence of Christmas. His perspective on life and the holiday season undergoes a profound transformation as he discovers that Christmas means more than material possessions or festive cheer.