When eight-year-old Jack and his seven-year-old sister, Annie, join a group of nineteenth-century explorers aboard the H.M.S. Challenger, they learn about the ocean, solve the mystery of its fabled sea monster, and gain compassion for their fellow creatures.

A young sea monster experiences his first day of school and, after a rocky start, he makes friends and has fun.

Pete the Cat and his crew battle a sea monster as they follow a map to find a hidden treasure.