Crockor is busy storing power in his laboratory so he can create his Sand Creatures. He wants to make enough of them that he will be able to control the entire ocean. Crockor picks Moby and the boys up on his radar and wants to capture them so they don't ruin his plans. Moby and the boys must do battle with Crockor and his Sand Creatures or the ocean may forever be in the hands of the evil Crockor. Tom is captured by one of the Sand Creatures but Moby is able to defeat him and free his friend. During the battle, Tom and Tubb are trapped under some rocks. Once again Moby saves them and then turns his attention towards Crockor. Moby destroys his lab and even though Crocker escapes, his plans of controlling the ocean are put to an end.