Ryn takes Ben and Maddie to a secret place below the ocean. Levi returns to land.
Nicole helps Ben and Maddie research the siren song appropriately. Other discoveries come to light.
Ryn wants to help Ben's mother. No matter the price.
Ryn returns to Ben and Maddie. The thrupple must learn to trust an outsider.
Ben and the mermaid enact a plan to ruin the oil company's plans. But nothing goes as expected.
Katrina is fighting to take back the merclan, while Ryn is helping Maddie fight for her mother Susan's safety.
Ben struggles with the siren's song. Xander finds out about the merpeople on land.