Kraa! the Sea Monster

There's an alien on the loose, and this one is so deadly that the Earth's only chance at survival is in the hands of the legendary Planet Patrol. It's a tough job--the alien is gigantic, well armored, able to live underwater, extraordinarily ill-tempered, and known only as Kraa! Luckily, the Planet Patrol is made up of four extremely precocious crimefighting kids with experience in ridding the world of aliens and other life-threatening creatures.