Seussical is a musical that weaves together Dr. Seuss's beloved stories, primarily Horton Hears a Who!, Horton Hatches the Egg, and Gertrude McFuzz. Narrated by The Cat in the Hat, the plot follows Horton the Elephant as he tries to protect the tiny citizens of Whoville living on a speck of dust, while also caring for Mayzie La Bird's abandoned egg. Despite ridicule from the Jungle of Nool, abandonment by Mayzie, and being put on trial, Horton is supported by his loyal neighbour, Gertrude McFuzz, and saves the Whos, proving that;

"a person's a person, no matter how small".