 Simon writes a message and puts it in a bottle and with some luck, Ariel, Sebastian, and Flounder find the letter, brave danger en route to the cave, and then they face a giant sea dragon.The dragon turns out to be Simon himself, the writer of the message, who's looking to have a party with some new friends.Bringing Simon home to King Triton poses another challenge until Simon helps King Triton to save Atlantica and its merpeople from an invasion of evil sea anemones.