Hidden in a remote place surrounded by high mountains, there lies a secret valley. There is an entrance, but you could pass by it a hundred times and still not see it... It's finally summer, and our friends from the hidden valley are gearing up for a dreamy summer afternoon! When a new, watery friend appears, Ticky, Mister Cold and the rest of the pals explore an exciting new undewater world. But a great monster lurks beneath the surface, and our joyous friends sure are causing quite a fuss! Will they be able to escape its terrible jaws?