David Shiner is the Cat in the Hat with Janine LaManna as Gertrude McFuzz. At right, LaManna with Cabaret's Michele Pawk who plays Seuss' Mayzie. The musical, set in and around Horton's home, the Jungle of Nool, is said to include elements and characters from the Dr. Seuss catalogue, creating an expansive world where The Cat in the Hat is a kind of tour guide. Horton the Elephant, Gertrude McFuzz, The Lorax and others sing about home, love, family, loss and imagination -- all "the thinks you can think." Seussical makes its pre-Broadway tryout at the Colonial Theatre in Boston Aug. 27-Sept. 30, then continues on to the Richard Rodgers Theatre Oct. 15 for a Nov. 9 opening.