In a remote valley of Whoville, the lovable inhabitants prepare for Christmas, a holiday they celebrate with overflowing joy and a tradition of sharing and giving. However, atop a lonely mountain lives an unpleasant and grumpy being known as the Grinch. This peculiar character, with a heart that, according to tradition, is "two sizes too small," deeply hates Christmas and everything related to it. His resentment towards the holiday is fueled by memories of his childhood and his disdain for the Whos' boisterous happiness.
Determined to put an end to the celebration, the Grinch devises an ingenious plan to steal Christmas. With the help of his loyal but clumsy dog Max, he disguises himself as Santa Claus and prepares to descend to Whoville on Christmas Eve. However, when he steals all the gifts, decorations, and the Christmas spirit from the Whos, he is surprised to realize that the true essence of Christmas goes beyond material objects. Through an unexpected encounter with a little Who named Cindy Lou, the Grinch begins to question his view of the world and the importance of community and love.
As the story progresses, the Grinch embarks on a journey of redemption and self-discovery, where he learns that the Christmas spirit can be found in the heart and not in the gifts.