Nadia: The Secret of Blue Water Season 1 Episode 28 The Floating Island ( Air Date 1990-12-21 ) Genre Animation, Action & Adventure, Sci-Fi & Fantasy, Drama, Family category. Overview "Jean, Nadia, Marie, and King are reunited with Grandis, Sanson, and Hanson. Together they all decide to live as a family on the new island, which Jean theorizes is moving.".