Ben must make a tough moral decision to help save Ryn, and it has far reaching consequences.
Ryn must undergo a difficult process to ensure the survival of her species
The military spy on Ben, Maddie, and Ryn, while the mermaid struggles once mating season begins.
Ryn takes Ben and Maddie to a secret place below the ocean. Levi returns to land.
Ryn returns to Ben and Maddie. The thrupple must learn to trust an outsider.
Ben struggles with the siren's song effects, but Ryn also struggles with her feelings for him and Maddie, too.
Ben struggles with the siren's song. Xander finds out about the merpeople on land.
Helen reveals more of her history. Bristol Cove deals with the aftermath of a merfolk attack.
The merfolk have a civil war between their hierarchy on land, involving everybody in Bristol Cove.
Bristol Cove mourns, as Xander discovers the truth about Ryn.
Ben goes out to sea, trying to thwart the military. But there's worse trouble than the government on the water.
Ben works with his Ted, to find info from the inside. Maddie gets to know Elaine better. Chris returns to Bristol Cove.