Ryn brings a new mate ashore for the good of the colony, but it raises emotional questions for Ben and Maddie. Mermaid mating season has begun, with Ryn knowing she will need to go back to the sea to ...

In an effort to save Hope, Ryn and Ben confront Tia in an undersea battle between the mermaid tribes. Maddie and Robb work to find a cure for Xander, while Helen and the hybrids help restore order.