"The Cat in the Hat," and other favorite Dr. Seuss characters are onstage in the local production of "Seussical Jr.," a fantastical musical extravaganza from Tony winners Lynn Ahrens and Stephen Flaherty. Transporting audiences from the Jungle of Nool to the Circus McGurkus, the infamous cat narrates the story of "Horton the Elephant," who discovers a speck of dust containing tiny people called the Whos. Horton must he protect the Whos from a world of naysayers and dangers, and he must also…