Watch Siren

In the season finale, the enchanting siren song takes hold of Ben and Decker. Meanwhile, Dale must answer for the escalating crime in Bristol Cove.

Donna comes ashore with two other members of her colony to bring Ryn back home. When mermaids once again begin wreaking havoc throughout the town, Dale tries to put an end to it once and for all.

Bristol Cove mourns a loss causing Ryn to experience a new human emotion.

When Ryn is taken in for questioning, Maddie rushes to her rescue. Meanwhile, Ben and Xander return to the deep sea to search for answers, only to be met by an uninvited guest.

When Ben and Maddie attend his mother's fundraising gala, an unexpected guest shows up and offers to put an end to the overfishing that's threatening the lives of the mermaids in Bristol Cove.

Ben begins to investigate some suspicious overfishing, meanwhile Decker ramps up his efforts to find his escaped mermaid and shows the true extent of his influence.

Dale and the local police's investigation starts pointing directly to Ryn, meanwhile Xander and Calvin's search for Chris heats up when they locate the nurse who works at the military bunker.

Ben and crew of The North Star uncover a device emitting a strange sound. Meanwhile, Ryn finds shelter in the home of the local folklore expert.

In this epic tale, the coastal town of Bristol Cove is turned upside down when a mysterious girl appears and begins wreaking havoc on the small fishing town. Using their resources, marine biologists Ben and Maddie must work together to find out who and what drove this primal hunter of the deep sea to land, and are there more like her out there?