As a child, "The Grinch" has a very traumatic experience, which is why he hates Christmas. When he was young he was made fun of by his classmates because of his appearance, which is why he lives in his mountain cave on the top of mount crumpit and not in "Whoville". He decided to disguise himself as Santa Claus and go to "Whoville" to steal all the decorations and presents. However, small "Cindy Lou Who" manages get the "Grinch" to like Christmas once again.