The Grinch and his loyal dog, Max, live a solitary existence inside a cave on Mount Crumpet. His main source of aggravation comes during Christmastime when his neighbours in Whoville celebrate the holidays with a bang. When the Whos decide to make Christmas bigger and brighter, the disgruntled Grinch realises there is one way to gain peace and quiet. With help from Max, the green grump hatches a scheme to pose as Santa Claus, steal Christmas and silence the Whos' holiday cheer once and for all.
Buddy (Will Ferrell) was accidentally transported to the North Pole as a toddler and raised to adulthood among Santa's elves. Unable to shake the feeling that he doesn't fit in, the adult Buddy travels to New York, in full elf uniform, in search of his real father. As it happens, this is Walter Hobbs (James Caan), a cynical businessman. After a DNA test proves this, Walter reluctantly attempts to start a relationship with the childlike Buddy with increasingly chaotic results.