Siren (2018)

S03E10 The Toll of the Sea

To rescue Hope, Ryn and Ben engage Tia in a fierce underwater confrontation among the mermaid clans. Meanwhile, Maddie and Robb tirelessly seek a remedy for Xander's condition, while Helen and the hybrids strive to bring stability back to their world. Ted faces challenges in coming to terms with Ben's new reality. This marks the thrilling season finale.