A new threat wreaks havoc as more mermaids land on the shores; Ben tries to cope with the siren song's aftereffects...Ryn (Eline Powell) looks for new housing for the mermaids; Ben (Alex Roe) becomes Levi's mentor; Maddie (Fola Evans-Akingbola) continues to struggle with her mother's presence...Dale (Gil Birmingham) copes with the fallout from Maddie and Ryn's encounter with the man from Susan's past; Katrina (Aylya Marzolf) tries to get the rest of the pack to join her side...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 and Xander (Ian Verdun) deal with a shocking discovery about Chris (Chad Rook) and his connection to the military; Helen (Rena Owen) and Maddie reluctantly seek help from the hybrids as the threat of extinction looms...
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