Siren: Season 2 (2019)

A new environmental threat wreaks havoc on Bristol Cove's shores, bringing more mermaids to land and more threat of discovery. Ben continues to struggle with the effects of the siren song. Maddie's mom returns to town.

Ben, Maddie, and Ryn desperately try and keep the newly arrived mermaid pack hidden during the town's Mermaid Beauty Contest; and Elaine grows more suspicious of Helen.

Ryn puts on a fierce fight to defend his title of leader of the pack, while Helen uncovers plenty more about her family lineage

Ryn decides they need to find another solution for housing mermaids as the pack dynamics remain precarious; Ben becomes a mentor to Levi as he tries to learn how men behave on land; and Maddie continues to struggle with her mother's renewed presence.

Ryn continues to try to teach the other mermaids to be more human on land to better integrate, but some are starting to resist her; Maddie finds herself in a dangerous situation trying to help her mom, who has fallen off the wagon; and Ben and Xander reconcile in order to work together to get the mermaid pack back into the water.

Katrina tries to get the rest of the mermaid pack on her side.

Tensions rise following a shocking discovery. And living in a tank 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.