Percy the Dreaded Sea Monster

The Purple Grumblies are terrified when they hear Percy the Dreaded Sea-Monster is headed towards Grumblie Island. They escape to nearby Volcano Island over shark-infested waters by using their upturned umbrellas as sailboats, and there they hide inside the volcano just as Percy arrives. Hungry Percy climbs to the top of the volcano and peers inside; he knows the Grumblies are in there, he can sme...