The Cat in the Hat, Sally, and Dick take an undersea voyage aboard the S.S. Undersea Glubber! Traveling down from the Sunny Zone to the Dark Zone to the Trench at the bottom, Captain Cat and his crew get up close and personal with the different life forms found at each level of the ocean. Along the way, they meet sharks, jellyfish, dolphins, manatees, whales, and sea cucumbers, to name just a few!

Bonnie Worth is the author of countless books for young readers, among them 18 of the Cat in the Hat's Learning Library books, including Oh Say Can You Say Di-No-Saur?, If I Ran the Rain Forest, Oh Say Can You Seed? (winner of the 2003 Ohio Farm Bureau Award), Hark! A Shark!, and If I Ran the Horse Show.