A grumpy hermit hatches a plan to steal Christmas from the Whos of Whoville.
In Whoville, on a night known as "Grinch Night", which commences when a "Sour-Sweet Wind" blows and a chain of events causes the Gree-Grumps and Hakken-Krakks to prompt Grinch into terrorizing the Whos, as he believes such nights are the perfect nights for a Grinch Night. Later, Euchariah, a polite little Who with a slight astigmatism, goes to use the outhouse (referred to as "the euphemism" in the story), but is swept away to Mt. Crumpit by the wind.
The Grinch wakes up in a good mood one morning until his reflection in the mirror prompts him to repeat the "Grinch's Oath" and prove himself a Grinch. Meanwhile, the Cat in the Hat goes on a picnic. Their paths cross when the Grinch can't get his car around the Cat's, and things quickly escalate into a fierce car chase after the Cat unintentionally insults the Grinch by calling him "Mr. Greenface."
On the outskirts of Whoville lives a green, revenge-seeking Grinch who plans to ruin Christmas for all of the citizens of the town.
In the town of Whoville, the humanoids called Whos are filled with excitement about celebrating Christmas. The only one who isn't amused is a cantankerous, green furred creature called The Grinch, who has a heart "two sizes too small" and lives in a cave on the top of Mount Crumpit just north of Whoville. The Grinch has a pet dog named Max and they both only visit Whoville when the Grinch needs to buy food and do bad things.
The musical, with book and lyrics by Tim Mason and music by Mel Marvin and featuring the hit songs “You’re a Mean One, Mr. Grinch” and “Welcome Christmas” (by Albert Hague & Dr. Seuss) played on Broadway during the holiday seasons of 2006 and 2007.