Seussical the Musical is based on the tongue twisting works of Dr. Seuss. The story is mostly a combination of Horton Hears a Who and Horton Hatches the Egg. However there are influences from many other Seuss works including: The Cat in the Hat, McElligot's Pool, I Had Trouble in Getting to Solla Sollew, Did I Ever Tell You How Lucky You Are?, The Butter Battle Book, Oh, the Places You'll Go!, How the Grinch Stole Christmas! and others.