Oliver, having grown up in a family of researchers, embarks on his greatest adventure as he sets out to find his parents who disappeared while exploring newly emerged islands in the sea. Accompanied by his new friends—a grumpy old albatross, a short-sighted mermaid, and a friendly island named Cliff—Oliver confronts intrusive sea monkeys before he can execute his rescue plan. The story celebrates curiosity and the spirit of exploration, leading to truly miraculous experiences.