Ben must make a tough moral decision to help save Ryn, and it has far reaching consequences.
Ben must put aside his jealousy in order for Ryn to mate.
Nicole helps Ben and Maddie research the siren song appropriately. Other discoveries come to light.
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 effects, but Ryn also struggles with her feelings for him and Maddie, too.
Ben's struggling with Ryn's siren song, as she also struggles to hold onto power amongst her people.
Ben struggles with the siren's song. Xander finds out about the merpeople on land.
The merfolk have a civil war between their hierarchy on land, involving everybody in Bristol Cove.
The longer Ryn is out of the water, the more she deteriorates. At the military compound, the other mermaid causes chaos.
Maddie and Ben try to help Ryn, as well as study her. Xander tracks down a lead on Chris, who's still locked up in the military's lab.