Siren - Season 2 (2019)

Ryn looks for new housing for the mermaids; Ben becomes Levi's mentor; Maddie continues to struggle with her mother's presence.

Maddie finds herself in a dangerous situation; Ben and Xander reconcile to get the mermaids back into the water.

Dale copes with the fallout from Maddie and Ryn's encounter with the man from Susan's past; Katrina tries to get the rest of the pack to join her side.

Tensions rises following a shocking discovery; The water tank starts to have an adverse effect on the mermaids; Ryn makes a deal with a complicated ally.

Mermaids and humans join forces to stop the oil company, but their efforts have a devastating effect.

Everyone deals with the fallout from the oil rig attack; Ryn returns to land to follow through on an agreement she made with the military.

Elaine's treatment from the military's medical trial comes with side effects to the mermaid cells; Helen and Rick learn more about the hybrid status.

Maddie and Ben contend with how to help Ryn; When Maddie gets sirened, the group strive to uncover how the siren song really works.

Ben, Maddie and Ryn venture under the sea to a special place in Ryn's homeland that could help with their conditions.

Ryn must return to her colony for mermaid mating season; Ben and Helen hunt down the hybrids when they lure a mermaid to a remote location.

An unsuccessful mating season leads to questioning the possibility of the mermaids procreating on land; Ryn brings a new mate for the good of the colony.

Ben and Xander deal with a shocking discovery about Chris and his connection to the military; Helen and Maddie reluctantly seek help from the hybrids as the threat of extinction looms.

Ben faces a choice that has rippling consequences amongst mermaids, hybrids and humans alike, as the truth about mermaids is exposed.