Siren Season 3 Episode 6 The Island ( Air Date 2020-04-30 ) Genre Sci-Fi & Fantasy, Drama category. Overview "Ryn discovers a refuge of injured mermaids that escaped Tia’s violent takeover. Ben and Xander get caught in a battle with Tia’s troops. Maddie feeds Robb half-truths to secure his discretion. Ted explores his family lineage.".