New World Order – Ben faces a choice that has rippling consequences among mermaid, hybrid and human alike, as the truth about mermaids is exposed.
Sacrifice – Ben and Xander deal with a shocking discovery about Chris and his connection to the military; and Helen and Maddie reluctantly seek help from the hybrids as the threat of extinction looms over the merpeople.
The Last Mermaid – Ant is determined to find out what’s that mermaid-shaped thing swimming outside the Aronnax, even when pirates get in his way.
The Outpost – Mermaid mating season has begun, with Ryn knowing she will need to go back to the sea to help her colony. The hybrids convince one of the mermaids to come with them to a remote location, leading Helen and Ben on a hunt to find them. A journalist turns to Xander for help putting the pieces together of the night of the oil rig disaster, but Xander is torn on where his loyalties lie and what helping him could mean for his future.
Serenity – Ryn finds out that staying on land longer makes it harder for her to go back to the ocean; Helen and Ted bonds over their family histories.
Mixed Signals – Maddie and Ben are facing a dilemma on how to help both Ryn and Elaine; The military gets interested on how they can use Ryn against the other groups.
All In – Elaine Pownall seeks treatment from the military’s medical trial using mermaid cells.
No North Star – Ryn returns to land to follow through on an agreement she made with the military.
Leverage – Humans and mermaids join forces to stop the oil company.
Entrapment – Tensions rise following a shocking discovery; living in a tank rather than the ocean starts to have an adverse effect on many of the mermaids; hoping to save her kind and help her human circle, Ryn makes a deal with a complicated ally.