Filburt comes of age and must go to the islands to spawn. He doesn't want to, for fear of growing up. Heffer becomes a security guard and finds it isn't all he expected it to be, in fact, it's quite scary.
Filburt turns 21, and finds himself battling the 'forces of nature' that want him to return to Kerplopegos Island to become an adult. Rocko and Heffer try to help, but Filburt hijacks a boat and heads off to Kerplopegos. Rocko and Heffer go after him, and soon after, the force of nature end, and Filburt returns to his normal life.