Following the money, Hilde is drawn to the most powerful company in Erie Harbor. Someone unexpected comes back into Izzy’s life.

A storm causes a town power outage and everybody gets together at Jack’s bar. Mel grapples with her revelation. Preacher investigates Paige.

Charmaine tells a stunned Jack to make a decision while Mel is left reeling and Hope is filled with guilt. Meanwhile, Paige opens up to Preacher.

Mel endeavors to help an uncooperative Charmaine get hydrated while thinking about what transpired with Jack. Calvin offers Brady a new job.

Jack’s war memories haunt him when he reunites with his Marine friends. Mel struggles to handle conflict with her sister-in-law.

While Jack helps Mike zero in on Calvin, Mel and Doc investigate a mysterious outbreak that could be related to food poisoning. Hope learns a secret.

Charmaine asks Jack for support at the baby shower. Mel has a tough conversation with Cassandra. Preacher worries about Christopher after their call.

Hope’s health scare prompts a difficult conversation with Doc. Charmaine asks Mel uncomfortable questions. Paige keeps secrets.

Under pressure, Mel and Jack respond to a medical emergency on a remote illegal pot farm. Charmaine and Hope exchange words.

Jack makes a momentous decision as Mel grapples with how to share surprising news. Doc is plagued with concern. Preacher meets with Paige’s friend.

Mel attempts to avoid celebrating her birthday while remembering the past. Doc confirms his troubling diagnosis and begins looking for his replacement.

Ryn returns to land to explore human motherhood. Maddie and Robb come across a gruesome discovery. Ben experiences mysterious side effects and Ted confronts Helen.

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…

As an old friend visits Helen, 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…

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…

Ryn seeks help only to learn the secret existence of her unborn child. Ben sets out on a dangerous path to help his mom, while Xander tries to establish himself…

Ben begins to investigate some suspicious overfishing, meanwhile Decker ramps up his efforts to find his escaped mermaid and shows the true extent of his influence.

Mating season turned out to be less successful than everyone had hoped, leading them to question the possibility of the mermaids procreating on land. Ryn brings a new mate ashore…

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…

When Ben and Maddie attend his mother’s fundraising gala, an unexpected guest shows up and offers to put an end to the overfishing that’s threatening the lives of the mermaids…

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

Bristol Cove mourns a loss causing Ryn to experience a new human emotion.

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.

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. Meanwhile, when one…

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…

Ryn goes back to the ocean to get help for Ben and Maddie’s conditions but discovers that continuing to go back may get harder than she realized the longer she’s…

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…

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…

The coastal town of Bristol Cove, once known for being home to mermaids, is turned upside down with the arrival of a mysterious girl.

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.

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…

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…

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…

With more mermaids landing at Bristol Cove’s shores, the threat of discovery increases. After his encounter with the siren song, Ben tries to cope with the after effects. Maddie’s mom…

Ben, Maddie and Ryn desperately try and keep the newly arrived mermaid pack hidden from the rest of the town, but the new mermaids’ quick degradation on land forces them…

As Col. Carrera takes charge of the murder investigation, Kovacs sets out to find Axley’s bounty hunter, and Poe’s memory glitches worsen.

While the planet celebrates Harlan’s Day, Kovacs hatches an escape plan, Quell pieces together fragments of her life, and Poe faces a reckoning.

When Quell’s sleeve begins to shut down, Poe and Ms. Dig send her into VR, where Kovacs finally learns the truth about her deadly rampages.

Shattered by recent losses and a sweeping new protocol, the Travelers face a bleak future with only one long-shot chance to succeed in their mission.

MacLaren, his team and their loved ones regroup at a safe house protected by the FBI, but doubts and betrayals may sabotage the rest of their mission.