The BEST Episodes of Siren (2018)
Every episode ever - ranked by fan votes!
Last Updated: Sep 18, 2021
A costal town known for its legend of once being home to mermaids is turned upside down when a mysterious girl appears and begins wreaking havoc.
#1 - The Toll of the Sea
Season 3 - Episode 10 - Aired May 28, 2020
In an effort to save Hope, Ryn and Ben confront Tia in an undersea battle between the mermaid tribes. Maddie and Robb work to find a cure for Xander. Helen and the hybrids help restore order. Ted struggles to accept Ben's reality.
#2 - Leverage
Season 2 - Episode 8 - Aired Mar 14, 2019
Mermaids and humans join forces in a radical plan to stop the oil company, but their efforts have a devastating effect. And facing an uncertain future, Ben, Maddie and Ryn come together for a romantic farewell.
#3 - The Island
Season 3 - Episode 6 - Aired Apr 30, 2020
Ryn discovers a refuge of injured mermaids that escaped Tia’s violent takeover. Ben and Xander get caught in a battle with Tia’s troops. Maddie feeds Robb half-truths to secure his discretion. Ted explores his family lineage.
#4 - Distress Call
Season 2 - Episode 6 - Aired Feb 28, 2019
Dale copes with the fallout from Maddie and Ryn’s encounter with the man from Susan’s past, while Katrina continues to persuade the rest of the mermaid pack to get on her side, even if that means brute force against both mermaids and humans.
#5 - Dead in the Water
Season 1 - Episode 7 - Aired May 3, 2018
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.
#6 - Entrapment
Season 2 - Episode 7 - Aired Mar 7, 2019
Tensions are rising following a shocking discovery. And living in a tank rather than the ocean is starting 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.
#7 - New World Order
Season 2 - Episode 16 - Aired Aug 1, 2019
Ben faces a choice that has rippling consequences amongst mermaid, hybrid and human alike, as the truth about mermaids is exposed.
#8 - Aftermath
Season 1 - Episode 10 - Aired May 24, 2018
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.
#9 - Street Fight
Season 1 - Episode 9 - Aired May 17, 2018
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.
#10 - Northern Exposure
Season 3 - Episode 7 - Aired May 7, 2020
Ryn, Ben, and Maddie must recruit new allies in the fight against Tia. Helen seeks answers when she's haunted by Donna's spirit. Tia obtains dangerous weapons she plans to use in her fight. Xander struggles to make amends with Annie.
#11 - A Voice in the Dark
Season 3 - Episode 9 - Aired May 21, 2020
Tia unleashes a deadly attack on Bristol Cove. Ryn, Ben and Maddie race against time to find a cure for Xander's mysterious illness, while anticipating Tia's next move. Baby Hope returns to land to reconnect with Ryn.
#12 - Primal Instincts
Season 2 - Episode 5 - Aired Feb 21, 2019
Ryn continues to try to teach the other mermaids to be more human in order to better assimilate, but some are starting to resist her, causing Ryn to wonder if she herself is becoming too human. Maddie finds herself in a dangerous situation trying to help her mom. Meanwhile, Ben and Xander reconcile in order to work together to get the mermaid pack back into the water.
#13 - On the Road
Season 1 - Episode 4 - Aired Apr 12, 2018
When the military facility goes on high alert, Chris manages to escape, but he’s not the only one who gets out.
#14 - Mommy and Me
Season 3 - Episode 5 - Aired Apr 23, 2020
Ryn returns to land to explore human motherhood. Maddie and Robb come across a gruesome discovery. Ben experiences mysterious side effects. Ted confronts Helen.
#15 - Oil and Water
Season 2 - Episode 4 - Aired Feb 14, 2019
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.
#16 - Survivor
Season 3 - Episode 3 - Aired Apr 9, 2020
Ryn seeks help only to learn the secret existence of her unborn child. Ben sets out on a dangerous path to help his mother. Xander tries to establish himself in his new career. Helen consults with Eliza to help contact Sarge.
#17 - Life and Death
Season 3 - Episode 4 - Aired Apr 16, 2020
Ben and Maddie help Ryn guide her surrogate though a life-threatening delivery. Helen and Xander deliver a hybrid corpse to Beth at The Ranch. Xander faces danger on the high seas during a ride-along with the Bristol Cove water patrol.
#18 - No North Star
Season 2 - Episode 9 - Aired Jun 13, 2019
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.
#19 - Natural Order
Season 2 - Episode 3 - Aired Feb 7, 2019
Ryn fights to maintain leadership of the pack when her loyalties are questioned over her friendship with Ben and Maddie. Ben interferes in a mermaid ritual and Helen discovers more about her family lineage.
#20 - Til Death Do Us Part
Season 3 - Episode 8 - Aired May 14, 2020
Ryn, Ben and Maddie must protect Bristol Cove from Tia's army. Ben's injections are producing unexpected results, which alarms both him and the others. Xander juggles best man duties at Calvin's wedding while also helping Helen.
#21 - Revelations
Season 3 - Episode 2 - Aired Apr 2, 2020
When another mysterious death is uncovered in Bristol Cove, Ryn suspects Tia. Maddie befriends a new acquaintance in Seattle. Helen warns the hybrids of trouble. Xander begins training and Ted revisits the past.
#22 - Being Human
Season 1 - Episode 8 - Aired May 10, 2018
Bristol Cove mourns a loss causing Ryn to experience a new human emotion.
#23 - Sacrifice
Season 2 - Episode 15 - Aired Jul 25, 2019
Ben and Xander are left dealing with a shocking discovery about Chris and his connection to the military. Meanwhile, Helen and Maddie reluctantly seek help from the hybrids as the threat of extinction looms over the mermaids. Ryn encounters the journalist who continues to chase his theories on mermaids to increasingly desperate ends.
#24 - All In
Season 2 - Episode 10 - Aired Jun 20, 2019
With Elaine Pownall’s health worsening, she seeks treatment from the military’s medical trial using mermaid cells, but the procedure doesn’t come without side effects to the mermaids. Helen and Rick learn more about the hybrid status, their history in Bristol Cove, and discover they are far less alone than Helen once believed.
#25 - Mixed Signals
Season 2 - Episode 11 - Aired Jun 27, 2019
Maddie and Ben contend with how to help Ryn knowing that in order to help Elaine get better, they will need to continue the procedures on Ryn. When one of the group gets sirened, there is more drive than ever to get to the bottom of how the siren song really works—further piquing the interest of the military in how Ryn can be of use to them.