Plot Synopsis

The coastal town of Bristol Cove, known for its legend of once being home to mermaids, is turned upside down when a mysterious girl, Ryn, appears and begins wreaking havoc upon the quaint village. Using their resources, marine biologists Ben and Maddie must work together to find out who and what drove this mermaid out of her home, and discovery if there are more like her out there. Soon after the girl's arrival, 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. Then, 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. And when the military facility goes on high alert, Chris manages to escape -- but he's not the only one who gets out. In honor of SIREN's two-hour series premiere, Freeform declared March 29 as International Mermaid Day.

The second season of SIREN premiered on Thursday, January 24, 2019 at 8pm ET/PT on Freeform. The second season promises an appearance of more mermaids in the coastal town of Bristol Cove ... but are they seeking revenge or is something more catastrophic driving them out of the sea? Marine researchers Ben and Maddie continue to establish a bond with mermaid Ryn, not only to protect her but to try to help save her entire civilization. In the season opener, "The Arrival," more mermaids are landing at Bristol Cove's shores, and the threat of discovery increases. After his encounter with the siren song, Ben tries to cope with the after effects. Maddie's mom returns to town and tries to connect with her daughter. Meanwhile, Ryn attempts to adapt to life on land. After a three-month break, SIREN returned with new episodes on Thursday, June 13, 2019 at 8pm ET/PT on Freeform. It the summer premiere, "No North Star," Ben, Maddie and the other humans deal with the fallout from the attack on the oil rig, while the mermaids reacclimate to their ocean home. Ryn comes back to land to follow through on an agreement she made with the military, despite not knowing what their ultimate goals are.

Season 3 of SIREN premiered on Thursday, April 2, 2020 from 9-11pm ET/PT on Freeform, with back-to-back new episodes. Ben's shocking decision to let the reporter die at the end of Season 2 has ripple effects in his relationship with Maddie and Ryn. Meanwhile, a dangerous, sophisticated new mermaid arrives in Bristol Cove, challenging Ryn's leadership and igniting an epic undersea battle between rival tribes. All of this is complicated by the fact that Ryn's baby, now being carried by a surrogate, must be protected at all costs. In the season opener, "Borders," an old friend visits Helen, and a new mermaid arrives leaving Ryn questioning their motives. Maddie learns the truth behind Ian's death, as Ben fights for his mother's treatments. While Xander is inspired to take on more responsibility. Then, in the season's second episode, "Revelations," another mysterious death is uncovered in Bristol Cove, and Ryn suspects Tia. Maddie befriends a new acquaintance in Seattle. Helen warns the hybrids of trouble. Xander begins training and Ted revisits the past.
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On Thursday, May 28, 2020 at 10pm ET/PT, Freeform premiered "The Toll of the Sea," the Season 3 finale of SIREN. In an effort to save Hope (guest star Alix West Lefler), Ryn and Ben confront Tia in an undersea battle between the mermaid tribes. Maddie and Robb work to find a cure for Xander, while Helen and the hybrids help restore order. Ted struggles to accept Ben's reality.